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Better off building one to be honest. You don't really need a terabyte of harddrive space, and that's usually where retailers get you with prebuilt machines. Heck, I have a 500 GB harddrive, and fraps almost half filled it up with 2 hours of non-stop LIMBO Gameplay. (Avg~ 70 GB per hour)
For just gaming, you don't need an i7.
Go for AMD Radeon HD for cheaper prices on top of that. (However, if you play games that have a ton of dynamics, particle calculations, then it's NVIDIA. However, textures are it's weak point.)
I wouldn't recommend this, especially since they don't tell you what graphics it has: Best Buy Excl. Lenovo Model 77275NU (Meaning when best buy stops selling it, lenovo stops support.) But it's the only one that would come close pre-built wise, and is 699 USD, which is probably not going to get you a whole lot in good graphics, I'm sure. Likely just boasting a 4250, which is ugh.
At retailers, the prices are driven up solely based on: RAM, Harddrive space, brand and if it has wireless capabilities.
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Agreed, textures are NVidia's FUS ROH DAH