Thanks for sharing your discoveries on mining as well.

I've found that the Litecoin Mining Hardware Comparison page is super helpful for evaluating video cards and rig configurations. It is here: https://litecoin.info/Mining_hardware_comparison.

Also don't forget to factor in the energy costs of the PSU efficiency and the power costs of the overall computer as well into your calculations. I like 7950s for mining, particularly the Gigabyte 7950 - GV-R795WF3-3GD and the Sapphire Vapor-X 7950. I like to buy these at a discount for about $200 a card from ebay, craigslist, newegg (with sales) and amazon.

Good luck!