I would get s-3's . a lot of them.
I would set them to freq 175 they will mine at 350 and be quiet.
if you don't mind noise i would set them at freq -225 231 and use 3 per evga 1300 g2 psu
I would go to the marketplace here and write a thread .
I want used S-3's I would prefer you to be close to my zip code.
here is the board.Also ask for working evga's 1300 g2 psu's
https://bitcointalk.org/index.php?board=75.0