be careful with the float X2, Fox recalled a bunch of them for being grenades. I have a couple friends riding DHX2s, and the coil version is awesome. it's essentially a CCDB that feels even better, and has a better company backing it. I've ridden CCDBs exclusively on my DH bikes for the last 7-8 years (multiple coil and airs) with zero failures of any form, but my next shock will be a DHX2. CC's customer service is rubbish.
another option that hasn't been mentioned is finding a good used DHX air (should be cheap as dirt), and having Craig at Avalanche put his speed sensitive goodies inside. his customer service is second to none, and I'm pretty sure the shock can be tuned however you like.