I am thinking about building 2 or 3 of the following rigs. Advice and feedback appreciated.

Motherboard http://www.newegg.ca/Product/Product.aspx?Item=N82E16813157295 $160
Processor http://www.newegg.ca/Product/Product.aspx?Item=N82E16819116409 $50
Memory http://www.newegg.ca/Product/Product.aspx?Item=N82E16820104262 $80
Hard Drive http://www.newegg.ca/Product/Product.aspx?Item=N82E16822136591 $50
Power Supply http://www.newegg.com/Product/Product.aspx?Item=N82E16817151110 $210
GPU's: Sapphire ATI 7970 http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=7369719&CatId=7387 $440 X 3 = $1320