not rly to be fair, you can build a decent rig with multiple 5770 cards,
you can stack up to 5 on a simple 700w psu,
given that your mobo can accomodate them ofc, (3 regular slots + 2 on pci-e x1 risers is standard, i think)
So you have a 1ghash mining rig with a relatively cheap psu (2x5830+5850 would require at least 850w to run properly OC'ed)

Last time i checked, 5770 was one of the best at $/Mhash and W/Mhash
And it is as low-end as it gets.