Bulldozer shmulldozer, it's just an illusion in the AMD desert. Just when you think it's here, it disappears to a later date...
I'm partial to the GTX560's and GTX580's. A bit more than you wanna spend, but worth it. I know guys with AMD 6950's and 6970's that are happy with them too. As far as full GPU blocks I'd recommend these in rank: 1) XSPC
or DANGER DEN
(Copper w/black Acetal), 2) Heatkiller
, 3) Aquacomputer
. Stay away from anything EK!
My GTX580 DD block cools and looks amazing, and they are a great WC company right here in the USA (Oregon). The block is well crafted, but a bit heavy. The XSPC is lighter, the least expensive, and yet cools very well. The main thing I'd say is for you to stay with copper materials. Some manufacturers are having problems with nickel plating, so I'd just avoid it. Your Rasa CPU block is copper so stick with copper blocks on everything else too. Makes it simpler in your loop chemical wise... which is a good thing.