Hi all. I'm building and selling mining rigs for bitcoins. These are great starter rigs:
546MH/s with the stock configuration -- earns about 1BTC per day at current difficulty
Low power CPU and high-quality power supply lower your electricity costs
2 AMD Radeon 5830 cards
AMD Sempron 140 2.7GHz Processor
The price in bitcoins fluctuates with the USD exchange rate, but they are roughly 27 BTC.
I'll also accept dollars if you prefer.
You can buy them through my website at http://bitminer.us/
There is a lot more information there.
Feel free to post questions here, or mail me directly through the website.
EDIT: I'm out of stock, but I'll still take pre-orders if you're willing to wait a week or so while I source more parts.