I like infinty stuff, too.. and ASB, MTX subs are great, and I like the amp, too, but not for subs.. that amp is designed for running door speaks and components..
I'd get a mono or 2ch amp for the subs, and you can get more power for 300 dollars. there are some decent amps cheap at overstock
http://www.overstock.com/?PAGE=CATLI..._SSUB_CAT=2342