I'm looking to slowly wind down my mining operation as I am moving in a month and don't want to bring it all with me. Here are the stats and approximate retail prices:
MB MSI 890FXA-GD70 AM3 R $185
CPU AMD|SEM 140 2.7G AM3 RT $38
4x VGA SAPPHIRE|100297L HD5830 RT $440
PSU CORSAIR|CMPSU-850HX 850W RT $165
MEM 2G|GSKILL F3-10666CL9S-2GBNS $20
SSD 16G|KST SS100S2/16G RT $55
The parts for this rig retail at $900, and as we all know you cannot get Radeon 5830s at retail anymore, so you would probably have to pay closer to $600 just for those, putting the cost over $1000.
This has ubuntu 11.04 preinstalled on the 16gb SSD, with SSH enabled for remote access, and a script to launch the miners automatically upon power up. All you need to do is plug it in and modify the script to point at your pool.
It has worked perfectly for the past few weeks with no downtime except from when I was moving parts from one location to another. The radeon 5830s put out a constant 280 mhash each, so a total of 1120 for the rig. I did flash the BIOS on the cards to run at 925mhz clock and 300mhz memory, so that likely voided the warranty - be aware of that when purchasing.
My price is $800 plus the actual cost of shipping. There is no case for this rig, and you would probably have trouble finding one that could fit 8 expansions slots comfortably without overheating. I have run it open air, and it works fine.
This will ship from Maine in the US. If you're interested let me know your zip code and I can come up with a quote for shipping. It will weigh around 20 pounds and probably cost around $30 to the East coast and $50 to the west coast for priority mail shipping. I'll accept paypal for a 2.5% fee, bitcoins, Mt. Gox, or any other popular payment method you know of. Let me know if you have any questions.