+1 for Hope V2's...
Well I have just purchased a set of front and rear kits from Wiggle. They had the cheapest price I could find, delivered and they only sell them with the floating rotors (V2) of a 'normal' rotor (M4), with the option to upgrades.
While I haven;t given them a real workout yet, the initial feel is excellent, a bit of time and patience required to set them up, but once this is done they are very impressive. The fact that the amount of pressure applied to the lever (modulation) dictates the brake 'force' is a real plus for me, the build quality is excellent, and so far the avaliability of parts is good (olives, seal and rebuiold kits etc). Bleeding the brake is easy compared to some other brands, with videos on YouTube the best I have found so far. Another website offers some great run throughs of basic maintenance jobs complete with pictures!
http://steveukmtb.wordpress.com/hope-braided-hydraulic-brake-hose-assembly/ ( shortening the braided hose - my first job!)
They have replaced some Avid Codes, and while they were a good brake, the adjustibilty, build quality and most importantly the modulation has proved to be a worthy upgrade.
I fussed over the M4 or V2 and went with the V2 for the slightly more braking power afforded, and they were about $7 cheaper per end!
Hope (no pun intended) this helps in some way.