I agree with the others here.
-> 3012HO is very efficient but fairly expensive.
-> 3012LF a bit less efficient but go's a little lower, again fairly expensive.
If you're looking for something a little cheaper the KAPPA PRO-12A hits hard.
Its non neo so it weighs a bit more but costs half of what the others go for.
I have a 2x12 cab with the kappa pro 12's in it. Its heavy but hooked up to a 1400 watt qsc it puts out some serous bass.
Speaker Detail | Eminence Speaker
You can find all the above woofers new on ebay.