2x6850
4x5850

$20 wire shelving unit.

I could probably cut it to fit more stuff, but the little tab on the cards fits perfectly into the crossbeams to hold them up.  No cutting or modification required. Add a shelf if you need more room.



Needs a bit of cable management, but holds onto PSU's snugly, and can be easily picked up and moved.



Bottom rig uses a HDD only because I had an extra one and it is running P2Pool, which means lots of writes.