Looking for a gaming laptop ($750 usd max)

I am looking for a laptop that is prebuilt to last me through highschool (3 years). I would like it to be around 15 inches and capable of playing graphic intensive games such as diablo 3, minecraft, and skyrim. I would like it to be under $750 usd but I guess around $800 would be the highest I can go. I had be thinking of the msi X460DX-291US. It has a intel i5 2450m processor, 6gb ddr3 ram, and a Nvidia GeForce GT 630M graphics card (has optimus technology). I found one for around $700 dollars, but dont know if thats the best deal i can get for the money. Im open to your advise as to how much this laptop can live up to my demands or tell me if you know of any other prebuild laptops that could provide what I need that are in my price range.
-Thanks

p.s. I dont need a powerhouse, but something that can play most games that are out there and run at medium (preferably high) settings.