Is there any reason not to buy the least expensive card?
I have a reference design Sapphire model 64 and while it's still working pretty well it can certainly get up in the low 70's at full tilt. Great card though and is quieter and cooler than the Limited Edition card I had for a few months.
that makes me feel better, as i just got a saphire reference 64 to pu tin the new build
Just be sure to use two separate cables to the card and you'll be fine. The cooler does make some noise but it's nowhere near as loud as some of the previous reference designs.