People can play the game however they choose. Why is it a positive if you've played every class? Somebody can play all assault for all I care. If they contribute then all the better.
There are tons of guides on the web. It really is pretty damn easy. You'll run into little issue if you install each part correctly. Most people can screw up RAM placement and think they fried their computer :P.
It would be kind of pointless upgrading your GPU when your CPU will hold anything that is a 560gtx/6870 and above back. A 2.53ghz duo core is just going to struggle to deliver performance for high end gpus in games like BF3, SWTOR, Skyrim, etc. $119 for a 550gtx is not a big steal, nor is it "that" much of an upgrade over your 9800gt to blow your mind. I would honestly wait until you could afford a large upgrade or look for good deals on Kijiji/craigslist/ebay.
Computers are never future proof. Buy a top of the line dx10 card and it gets phased out by dx11. Buy a first gen dx11 gpu and in the future the architecture won't be good enough to handle bare minimum games with full tessellation. Always buy a PC for the here and now, never for the future. Buy an amazing multi gpu set up and then struggle with microstutter and poor support/performance for games in the first few patches/drivers when it releases. I sure hope you're not paying E1270 for a computer without a video card. What a joke and rip off. It can't be said enough, but you can build a beastly computer by yourself for E1270.
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