Other than manufacturer I don't see any difference other than the eVGA needs a 6-pin adapter which is supposed to be included but is not in a lot of the reviews. So I was going to go with the MSI 6800GS. Performance wise they should be the same right? Both seem to be quality companies from what I've read. Thanks.
http://www.newegg.com/Product/Product.asp?Item=N82E16814127200
http://www.newegg.com/Product/Product.asp?Item=N82E16814130258
http://www.newegg.com/Product/Product.asp?Item=N82E16814127200
http://www.newegg.com/Product/Product.asp?Item=N82E16814130258