I;m kinda new to this but I'm pretty sure it's gonna depend on how you wire the sub. Keeping it at 4 ohm is going to limit your choices of amps. If you wire the vc's in parallel that should get it down to a 2 ohm load and and severly increase you choice af amps. Sonic Electronix has a very wide range of amps and a decent price with free shipping on a lot of it. Ebay is another if you know what amp you want to get. But shipping can get expensive there.