I have the mtx 801d mono amp. Very good amp, i added the ebc remote bass knob. I have it powering a Polk Momo 12 (first model) in a sealed box. Sounds good. That would be a good choice for you, could get one on ebay. I paid about 280 plus shipping, something like that. Crutchfield has them for $499.00

Its a mono amp so when you hook up the 2 subs (there are connections for speaker 1 & 2) they will be in parallel.

The specs are here.