don't worry too much about brand.
As long as you buy from a reputable dealer you'll be fine.
(No flea markets!!)
Keep an eye out for knockoff flea-market junk like "Cervin Wega" and "Kentwood"....knockoffs of the real thing, and just garbage.
Also, be weary of companies like Pioneer and...
The BEST amp for "Bang for the Buck" is Memphis, hands down.
You can run the class Ds at 1 ohm all day and the power is incredible.
Rockford fosgate USED to be the best amp in the mid-late nineties, but now they are just Best Buy mass produced garbage. I hope you're ready for the 2-4...