that's a pretty good amp for those subs... personally I would get the MB Quart QAA1000 for that budget, but I'm a little biased towards MB. There are a lot of amps that would be good for those subs when you have 400 to spend. do you have the 2ohm or 4ohm version? I'm assuming 4ohm if you're looking at the Kx1200.1. The Qaa1000 would work with either though