Decent chip there, 1.33 is pretty good for 4850 I reckon!
Ah how come you didn't get the flow and temp combo unit from Bykski instead? I looked at these but found the Bykski one instead which does both and saves a lot of room. Good build so far mate, looking good! Let us know how you get on with the MP5 back block, be interesting to see how you plumb this in as its recommended to do it in parallel.
with all them OTT watercooling parts you should have added a RAM block aswell. i know it doesnt really do anything but i beleive the backplate cooler on the gpu doesnt do anything either (well not as much as you would hope).
but wow thats a nice build. im all about itx now though.