Should I get this computer?

[TheBulgarian]

PLEASE READ THE WHOLE POST!!!
I want to buy this computer:
http://atlanta.craigslist.org/atl/sys/2428641256.html
I need a new computer because I like to play games. I want to play games at least on med settings while having good frame rate.
Games like Starcraft 2, dead space 2, Cod games, bfbc2
I ESPECIALLY want to get this computer for BF3. I am on a budget and this is pretty much the only choice I see that I think will run it on med-high set with a resolution on 12xx times 1xxx.
I just want to know if this is a good computer to buy. I probably can upgrade at least 1 part of this computer like the CPU or the GPU
Which one would be the best to upgrade?
Should I even get this computer?
Please tell me the pros and cons about the CPU and GUP
Thank you~!

PS I know a lot of you on here have AWESOME rigs. I dont want to be like that. I just want a decent computer that can run games. I cant afford to buy so many things just to play games.

Last thing: If I could UPGRADE just ONE thing on this computer, which would it be and why?

 

[wolfeking]

that computer will be able to play most games just fine.

The GTS450 is a good GPU, but its not the best. A GTX460 would be an upgrade, or GTX560ti or above, but would not be necessary to get your games going at that low resolution (assuming you mean 1280*1024)