im new to gaming pcs and I think my first mistake was getting the x51 as I have heard its too small too upgrade and has too low a power supply I was wondering whats the best parts it can handle? and if its just not good enough what parts would I be able to keep from it so I don't lose out on even more money. its an i3- 2120 3.3 GHz with 6 gb of ram and a 1 tb hard drive don't know if that helps I would be looking to play games like bf4 and all the next gens on ultra so im just looking for the best/cheapest way to upgrade thanks in advance to anyone who can help