Dude I would not go with GP I have a multiple 1st place vehicle and was running GP2350 on a single sub and sucked. As far a what amp to go with check out Soundstream's new TRX amps. I am sponsored by Soundstream and have a complete Soundstream vehicle, but also check out US Amps, Cactus sound, TREO, or even HiFOnics (and yes I know HiFonics is the same company as Crunch, but HiFonics makes a higher quality amp). Remember the higher the ohms the less the distortion, 4 ohm better than 2 ohm. That is the biggest advantage to two seperate amps or one single amp.