If you have excellent credit, the credit card companies really want your business. In order to compete with one another, some cards offer excellent welcome bonuses just to get people to sign up. If you're willing to do a little homework, the perks can really add up. Companies like American Express (NYSE:AXP), Capital One (NYSE:COF), and Barclay's are offering some amazing sign-on bonuses, so why not take advantage?

Responsible spending is the key
But won't having too many open accounts hurt my credit score? Not necessarily. According to myfico.com, the average "high achiever" has a total of 4-5 open credit cards, but only uses about 7% of their credit limit. The number of cards you open has very little importance, as long as you don't carry too much of a balance.

Below are some of the best introductory deals you can take advantage of.

Will credit cards soon be completely worthless?
The plastic in your wallet is about to go the way of the typewriter, the VCR, and the 8-track tape player. When it does, a handful of investors could stand to get very rich. You can join them -- but you must act now. An eye-opening new presentation reveals the full story on why your credit card is about to be worthless -- and highlights one little-known company sitting at the epicenter of an earth-shaking movement that could hand early investors the kind of profits we haven't seen since the dot-com days. Click here to watch this stunning video.

Matthew Frankel has no position in any stocks mentioned. The Motley Fool recommends American Express. The Motley Fool owns shares of Capital One Financial.. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.