I haven't heard much about the square subs but what i have heard has been mixed. I don't think you could go wrong with Kicker amps, they are expensive but bulletproof. I don't know which model number to recommend but look for something to match the wattage of the driver.
btw, amps and speakers aren't generally made to work better with certain brands except in the case of stock systems like Bose, Infinity, and JBL, which custom make their amps/speakers to work in that particular application.
