Congratulations! Your portfolio is perfect. The collection of companies that you have assembled is ... mwah, tresmagnifique -- the perfect combination of bottle rocket and short wick. Celebrated investors like Warren Buffett, Peter Lynch, and David Gardner have you on speed dial. Riches beyond measure are just a few trading days away.

Now, I'd love to tell you that with a straight face. Really. I'd love to deny that I saw you nodding along with me just now. It's human nature, really. Every investor thinks he or she owns the best stocks. It's a bit like rooting for your alma mater's football team or cheering on that lottery ticket or roulette wheel. You think you've got a fighting chance to win -- or you wouldn't be there at all.

It's not hopeless. Beating the market is a lot easier than you think. It's just a matter of identifying the great growth stocks of tomorrow before the rest of the market comes around. Sound daunting? It isn't, really.

Best of breed in a flea-ridden world
By now, you've probably heard the expression "best of breed" countless times -- and you're probably wondering what it's all about. In the corporate software space, the phrase refers to cherry-picking the best applications that excel at a particular task. Instead of resorting to the integrated one-vendor solution suite, you assemble a hodgepodge of specialized brands. It's not the easy way out, but it is the best way.

When you think about it, investing is just like that. Even if your portfolio is heavily weighted toward a particular sector, or if there's a theme that resonates throughout your holdings, every stock you own is unique. To you, it was the best of its breed.

"Best of breed" has evolved in recent years. These days, it's the process of ferreting out the superior company in a particular sector. If you're talking biotechnology, Amgen (NASDAQ:AMGN) comes to mind as the company behind breakthrough drugs like Neupogen and Epogen. Even in a sleepy sector like retail, companies like GameStop (NYSE:GME) and Best Buy (NYSE:BBY) can become category killers by manhandling the competition to become the one brand that shoppers come to identify within their respective specialties.

The market rewards excellence. That's why finding these top performers is often a financially rewarding quest. What could be better than that? Well, for one, identifying these best-of-breed companies just as they begin to shine.

Finding great growth stocks early is the goal of our Motley Fool Rule Breakers newsletter service. It's not an intimidating process. Who here didn't know that companies such as Cracker Barrel parent CBRL Group (NASDAQ:CBRL), with its country store and front porch rocking chairs within a comfort foods eatery concept, and athletic apparel and footwear maker Under Armour (NASDAQ:UARM) were up to something special with their concepts early in their tenure? Even if you weren't familiar with their models, you still could have warmed up to their income statements.

Decelerate at the sign of acceleration
Under Armour is a recent pick for Rule Breakers subscribers. You may know it for its moisture-controlling clothing that has taken pro sports by storm. Earlier this year it made the bold move to enter the athletic footwear market with its "click clack" cleats.

How could investors have spotted something special in a company that specializes in donning winners on the playing field? You didn't have to dig a whole lot deeper than the top line here.

In 2005, Under Armour's revenues climbed an impressive 37% higher. This year, the company is clocking in well ahead of that pace. As a result, the company upped the ante back in July by delighting investors with the news that it will be growing its top line by roughly 46% here in 2006.

That's called accelerating growth. You just don't see it very often. Logic would dictate that as a company grows, it does so off a larger base of sales and earnings. That makes growth, on a percentage basis, more difficult to keep up with. Let's say a company produced revenue of $50 million one year, then $100 million the next. That's a cool 100% growth in revenue. If it clocks in at $160 million the following year, that $60 million more in sales is even better than the $50 million it generated a year earlier. However, on a sales-growth basis, it would simply mark a 60% improvement from the previous year's $100 million sum.

Under Armour is staying hot even as it toils away in a market with established titans like Nike (NYSE:NKE) and Adidas.

The stock pick of the litter
A recent top-line accelerator has been iRobot. The leader in consumer robotics, with its Roomba vacuum-cleaning automatons and now its Scooba floor-scrubbing saviors, has been growing awfully quickly in recent years. In 2004, the company generated 75% more in revenue than it had in 2003. Last year, it felt as if the company was coming back down to earth with a more modest -- yet still impressive -- 49% improvement in sales.

Now we find the company reporting results through the first six months of 2006 that have revenue soaring 69% higher than the previous year's figures. Even if it's ultimately a blip in a traditionally sleepy period, it starts the company off on the right foot this year.

Under Armor and iRobot share something else beyond a refreshingly potent case of accelerated growth. Both stocks have been singled out over the past year as Rule Breakers recommendations.

Of course, it helps if you understand why growth is accelerating. Whether it's an established company with a suddenly vibrant new product (iPod, anyone?) or a promising upstart bent on rewriting the rules (like iRobot), knowing a little about the disruptive shift that's taking place helps. However, you can always lean back on the income statement. Organic acceleration in sales growth is nothing to scoff at.

If you don't want to screen for success alone, why don't you join us in the Rule Breakers community? We're doing just that around the clock -- and now you can kick the tires for free as part of a 30-day free trial.

Congratulations! Your portfolio is perfect -- perfectly waiting for you to take the next step in market enlightenment.

This article was originally published Sept. 12, 2005. It has been updated.

Longtime Fool contributor Rick Munarriz does own shares in CBRL Group. GameStop and Best Buy are Stock Advisor recommendations. Under Armour and iRobot are Rule Breakers choices. Rick is a member of theRule Breakersanalytical team, seeking out the next great growth stock early in its stage of defiance. The Motley Fool isinvestors writing for investors.