Not Exactly a PC Mastermind

Well, I'm deciding to get a new computer, and since I'm not exactly a techy person, I decided to test my luck with you guys.
Would there be a difference between these two computers worth the extra $30?
http://www.sears.com/shc/s/p_10153_12605_00331958000P?prdNo=10
and
http://www.newegg.com/Product/Product.aspx?Item=N82E16883229285
I'll be playing games like Crossfire and Team Fortress 2 with the computer I decide to get. If you have any other suggestions for a computer within the price range of these, please don't hesitate. Thanks
EDIT: Sorry, forgot to mention, what would my frames rate be with these computers on Crossfire?

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