VF-900 and the chipset should MAYBE be fine. Im not sure exactly how big either of them are so i cant gurantee that. Also, i must have brought you on to Frozencpu or something but ill tell you, their prices are steep.
well noga, i just ordered myself the vf900 for my evga 7800 gt. I will let you know how it works, But I don't think they would say a aftermarket vga cooler would work with the 7800 series if those things got in the way at the very end of the card, so i wouldnt worry about them. And with the vf900, you get chipset heatsinks with them. www.newegg.com
ill bookmark this topic so I can tell you how my vf900 does. I wont receive it until tuesday.