As stated the sub has to be 10" and under a 4.5" mounting depth. I know Alpine Type S, JL W1 and so on fit these specs. I would prefer dual 2 ohm, but any will do. The amp I will be using is 150x1 @4, 230 x1 @2, 300x1 @1
Skar IVX or Sundown e-10? Just 2 to think about, they don't have their mounting depth listed, but you could email to ask. Cheap, good, and capable of handling the full power-range of the amp.
I have an eclipse SW4010, awesome sub, right at 4.5" sounds great gets really low, has a small slit in the surround, but performs flawlessly still just needs to be e-taped on the back of it for complete closure. $50 shipped.