I got my Sapphire 5850 Toxic 1GB clocked 950/300 and that's pushing 363MHash/s and never goes above 60C (60% fan).

Even though it said that it couldn't adjust voltages I pushed it up slightly to 1.15 so the card became stable above 925 core.

I will however get two 5850 Extreme and see what I can do with it :3