Why not just lose the stock heatsink+fan, and epoxy a blue Orb directly to the GPU?
Edit: Just put the card in the freezer for 20 minutes. Put a plastic card on the board for protection, insert a small screwdriver between card and heatsink, twist the screwdriver and the heatsink should pop right off.
I've never done this with an Nvidia card, but it worked very well for ATI 8500LE64. Went from stock 250/275 to 295/335 stable with Crystal Orb and cheap aluminum ramsinks. Use Arctic Alumina for epoxy, since it is neither conductive nor capacitive.
That also reduces total thickness of HS+fan, probably taking up one less adjacent PCI slot. I used Crystal Orb, which has better airlfow, but is thicker than the Blue Orb.
Hope this helps!