meh, I didn't really like my Diezel 4x12 at all. It just didn't fill the room with the big sound I wanted. It was laser-like in it's projection, and not very toneful. WAY too focused. I'm guessing the 2x12 would be even more so.
IMO,
look at the following 2x12's
Emperor (AWESOME, assuming you can deal with the strange, stained look)
Pacific (very hard to find)
Bogner
Avatar (cheap, underrated, sound way above par. you don't feel bad when they get beaten up in your car either. bonus!.)