I suspect the opinions will be a bit biased towards the EP600. From what I've read, they're all fantastic subs. You really can't go wrong with any of them.

If I had to pick one, it would probably be the EP600 simply because the new digital amplifier technology gives it an edge over the others.

M80v2 | VP150v2 | QS8v2
SVS Pci+ 20-39
Emotiva UMC-1 & LPA-1
M22ti + T-Amp, in the Office