I wouldn't get the punch series, they're Rockford's cheaper brand, and really no better than the competition. Rockford Power is actually a good brand, I've been very satisfied with my power stuff, never have had a problem, and good quality, though a little pricey.
As T-Bird said, class D is the way to go, in a sort. If you're extremely pickey about quality, AB all the way. If you want a good power/price ratio, and not go through alternators like condoms, class D is the way to go. I personally would go Class D, though my Power amp is AB, I regret it now that I have more power running through it and everything cuts out at idle.