Not so sure I agree that the 5830 is a bad choice. Granted they are hot and suck a lot of juice, but my 5830s get about 260 MH/s whereas my 5770s get 190 MH/s. Given a psu that could handle both you are probably better off with the 5830 unless your electricity rate is high.
Yeah, but the 5770 uses less power and is more efficient, regardless of electricity rate.
And christhecoolboy, we're talking about MHash per watt (efficiency), not MHash/s.