The new sapphire 5830 on sale at newegg is a great deal (as you can tell from all the posts about people picking up one or five)
I really think that they've redesigned the power delivery circuit (instead of simply stealing the 5870's circuit like reference 5830's) on these new boards, I'm not 100% certain but I think these use less power than the old ones do.
I just got one and it's doing 290 with the monitor attached, 293 without the monitor attached @ 950/300
Doing the same thing on my 2nd rig, after 950 it doesnt become stable for me.
I prefer the XFX over Sapphire though, easier to OC. (although the Sapphires have one fat fan on them)