My main question is whether it would be better to buy one of these computers, a prebuilt store computer, or to order parts and build it myself. The simulations suggest it would be cheaper to buy the used custom computers, but are those setups ideal for battlefield 3? In particular, most of these computers do not include a video card in the price, but the seller offers to add this one: http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Would this work well enough for bf3, or would it be better to get a better card or use SLI or Crossfire?
(I am not sure about whether to use an AMD or a Nvidia card, but I might play minecraft, and I read that Nvidia's are considerably better for that. Is that right, or do I even need to think about that with a set up for bf3?)
One extra question: I already have a monitor, but I doubt it would work well for this scenario:
18.5” LCD Dell, VGA only, 5ms response
Thank You for answering these questions in advance