I've got the Infinity variant of the JBL, but the 611a (456w rms @ 4 Ohms), not the 1211a. Great amps. I recommend the GTO. Got the gain set to deliver 400W RMS to my Assassin 12.
if you have a good battery id go with the Kenwood KAC-9103D... thats what i powerd my VR12's with and they were loud as hell you can get it on ebay brand new for around 200