For the GPU, I'd recommend Prolimatech PK-3, or TC Quantum.
For thermal pads, it doesn't matter too much what you use on the VRAM, but you want decent stuff for the VRMs.
Fujipoly has 17 W/mK pads that are the best I've seen. Frozen CPU is the only place I've seen them available in non-bulk quantities though: http://www.frozencpu.com/search.html?mv_profile=keyword_search&mv_session_id=eqjCM7LM&searchspec=fujipoly+17.0&go.x=0&go.y=0
I'd use the 11 or 17 W/mK pads on the VRMs, and more affordable ~6 W/mK (which is still way higher conductivity that stock pads) pads on the VRAM.
I would highly
recommend against using any pastes where there is any easily perceptible gap between surfaces. Most pastes/greases are not remotely suitable for filling large gaps, and using them on VRAM is risky and wasteful.
I would also avoid any TIMs with metal components where they may touch surface mount components or bridge contacts. You don't need conductivity to cause a capacitive short.Edited by Blameless - 2/6/13 at 9:02am