I was considering building a new computer, but I've never done anything like that before and assume that you would need to buy tools on top of the components for the computer. I'm worried about buying a few hundred pounds worth of components and ruining them.
So now I'm thinking along the lines of get another pre-built computer. I've spotted this one on ebay. I would like to use the computer for medium gaming, internet browsing & other general tasks. I'll be swapping the GT-520 for an ATI HD 7770.
My mum has also asked me to source a computer with a monitor and windows 7 for her and I found this one. She uses her computer for very light gaming, internet browsing, watching movies & listening to music.
Well that first build includes a junk PSU - if you wind up purchasing that you'll need a better power supply before you can run any decent graphics card, although I don't think I would trust anyone who says that a GT520 can run Battlefield 3.
What's your budget? I could suggest a system if I knew that.