I have 5 mining rigs that are comprised of 1000watt power supply MSI mobo sata hdd 1gb ram 2 PCI extenders so the cards dont kiss each other and 4x5830s running at around ~1300mhash each. Price is 1300 each ships from US and accept paypal,dwolla transfer or BTC. Windows installed, logmein software installed, afterburner installed with clocks setup and guiminer. Rig is ready to go, just turn on and put it which pool you would like to mine at.
I have 1 mining rig that is same specs as above but with 5850s so it produces around 1400-1500mhash. Price is 1400 for this one.
PM or post below if interested. Attached is a picture of the rigs, they aren't in a case but that helps for heat related things.http://i.imgur.com/4WwA8.jpg