I've always heard that the silencers from arctic are good, but only if you need it quiet. The stock heatsink is a screamer though and I'm almost always on water.
The Arctics are supposed to be the most powerful aftermarket solution shy of doing some sort of CPU hsf ghetto mod and attaching like an XP-90 to it or something, lol.
Zalman makes some pretty good looking GPU coolers as well, u might look at those.
Zalmans VF900-Cu looks promising. On Arthic side Accelero X2 is latest i believe also looks good. Tough both coolers pushes the hot air onto motherboard so might not serve you well if you dont have good circulation in the case.
I thought the acelerao pushes the air into ur pci slot, but doesnt actually vent outside the case. Either way If i get one I'll work up an acryllic/lexan contraption.
Heck yeah! That's what I would be getting if were on the market.
Those deffo look like the best possible vid card heatsinks. Pair one of those up with some of the new swifty bga ram sinks and you've got a supercharged vid card on air.