ever tried summarising the cost of components in a retail mac vs. individual component price...it's interesting...
2x e5620 £900
Mobo £100
PSU £50
6gb DDR3 £120
1tb HDD £60
ATI 5770 1gb £120
DVD-RW £30
FAG mouse £20
FAG keyboard £10
FAG Case £80
OS win7 £170 - not that, you'd pay for it.
Total PC £1660
Total Mac £3999.01
http://store.apple.com/uk/configure/Z0M4?mco=MTg2OTQ5OTk
prices obtained ebuyer.com
let me know if i forgot anything on the pc, im sure you can still fit it into budget...