I'm currently making a build for my friend, and what he want's is a gaming pc, as good as he can get it for £450, however his main purpose is to play portal 2, a game being released at the start of 2010, so my first question is that is it worth me building the system without a graphics card, and they near when the game comes out, to buy one, in the hope that in a couple of months the card i could buy then would be much cheaper.
So effectively, this pc is a £325-£350 pc without a graphics card.
Also, i'm UK based, so ebuyer is preferred, as well as overclockers.uk
that 4870 is a very good deal. it uses around the same amount of power as a gtx460. you could invest about £20-25 more and get the 5770, it has similar performance to the 4870 but uses less power and has directx11. saying that the gtx 460 768mb version is only around £10-15 more then the 5770 and has better performance then a 4870.