LL, I have Infinity Comps and an Infinity sub, yet I have a 4 channel JBL amp lol! Mind you, I plan on getting a 6 channel amp, Infintiy hopefully to upgrade the power everything is getting, will be really loud and sweet then.
As LL said, you shouldn't really limit yourself, I found this out when I bought my amp, lol! It's good for the money but could be better.