Hi the only problem with your computer is the power supply. I mean seriously you should have went with a great brand like TT or Antec. A power supply that is not powerful enough for a system can seriously strain it and eventually ruin the components. Yeah you'll probably get away with it with just that one graphics card, but if u plan to add a second you are not going to be able to. Or even just one 8800gtx would kill that thing. I would suggest this bad boy:
. These are just my opinions but if anyone else chimes in thats the first thing that they will notice.