I am planning on getting one Infinity Kappa Perfect 12.1 (either single 4 ohm, or dual 4 ohm, depending on amp) and I need help finding the best amp for SQ for around $500. the sub will be in a 1^3 sealed box. I was going to use infinity amps originally, but i heard them, and they sound like garbage. I care about SQ more than anything! I have heard Kicker, MTX, and Audiobahn, and they sound pretty good especially for the price. Any other ideas for about $500?