Go to ebay and look for a Hifonics Brutus or a Hifonics Thor.
I think my buddy in his MP3 is running 2 Infinity Kappa 10s (pretty power hungry) off a Hifonics Thor, and it hits really hard. The amp was fairly cheap too, it was around 100 bux.
And for the record, Pyramid audio products are not that great, I wouldnt expect too much from them.