I kno, figured min 1000watt amp x 15.6... amps would be 15,000+ watts for 29 18s.... is that really gonna be enough was a joking question.
OP -
Do some research, hit up a couple sound centers and listen to the setups. Your not really gonna get a feel for what is best unless you hear it personally. I love Memphis, used them for over a decade now, subs, amps, speakers, all of it... they are great, but to our local car audio specialist they are lower/mid grade quality, good for the price but overall in his opinion, lower quality. Focal is his cream of the crop, so to speak. Its all in what you can afford, and what your looking to do with your sound system.
Research, research, research, then buy