I actually went like this, in order:
V1.0 OEM BLOSE (yuck)
V1.1 2 DLS OA8's 8" IB (GREAT SQ, solid low end, one was factory defective, got a replacement but sold them before re-installing)
V1.2 2 Ascendant Audio Assassin 8" IB (Good low end, not as musical, but capable, only had 80wrms each on them and they sounded pretty good with only that much power)
V1.3 1 DLS SP12 12" Sealed, then ported (Sounded better sealed even though it was mean to be ran ported, got me on that one, EXCELLENT SQ and super transparent)
v1.4 1 Rockford Fosgate RFD2212 HX2 12" ported (Excellent sq tuned at 30hz, great response up to 125 hz [kept crossed at 80 though])
V1.5 1 Rockford Fosgate RFR3112 POWER HX2 12" ported (Balls to the wall great spl, even with a broken port tube [found out later])
V1.6 2 Critical Mass SS82's IB (Not meant for IB install, sounded GREAT, took 550 rms on the rear deck with ease, LOTS of output)
V1.7 2 Rockford Fosgate RFD2208 HX2 8's IB (TBD)