Spec me a gaming machine - £600

[OneTime]

Hi,

Looking to purchase a gaming machine. Got £600 to play with for the tower.
Already got a 20inch monitor and accessories.

Ideally, if I could get i5/AM3, for the same money, and see an improvement over the dual core spec below I'd be happy.

What I came up with so far:
Would like to keep the Antec 300. Nice, plain and simple case



Thanks.

 

[OneTime]

It's mainly for CSS...which is processor intensive. Obviously will be playing a few other games like football manager and Call of duty etc. £200 for the GPU seems a bit much over the top compared to what is being spent on the other components.