Could someone help me set up a gaming rig for about 700£?

[CAT-THE-FIFTH]

If you do look at the Phenom II X4 965 make sure you get the 125W C3 stepping!!

[Zhaoman]

The Q9550 and 5850 would come to £400 and the RAM and Case costs £130 and the Monitor £135 so altogether = £665 which is slightly over-budget.

An AMD Phenom + mobo with the same specs would come to the same price while an i5 750 + mobo with the same setup would come to £50 more so imo a new Phenom and mobo would be better at the same price. The OP definitely has a lot of options to consider.

[CAT-THE-FIFTH]

The Q9550 and 5850 would come to £400 and the RAM and Case costs £130 and the Monitor £135 so altogether = £665 which is slightly over-budget.

An AMD Phenom + mobo with the same specs would come to the same price while an i5 750 + mobo with the same setup would come to £50 more so imo a new Phenom and mobo would be better at the same price. The OP definitely has a lot of options to consider.

The OP already has 4GB of DDR2 which will do the job already so I was assuming that they were sticking with it!! I assume that they either have 667MHZ or 800MHZ RAM so they could run it in a 1:2 ratio with the 1333MHZ FSB of the Q9550.

There is also the cheaper Q9505 which has 6MB of L2 cache which is also worth a look.

Anyway I was just indicating that upgrading their current setup is also another alternative way to the OP to improve the performance of their PC.