Thanks for your replies.
That what i decided to go for

AMD Athlon64 3000 Venice Retail Socket 939 £100
Abit AN8 Ultra Socket 939 £80
Corsair 1GB XMS3200 DDR SDRAM £100
3 x Barracuda 7200.7 Hard Disk Drive 80GB SATA Native Command Queuing 7200RPM - OEM £120 (£40x3)

Enermax Noisetaker 535W ATX V2.0 £50
AOpen 16x DVDRW Chameleon Retail £30
Gigabyte GeForce FX5750 128MB PCI-E £58
Any case no psu £30
TOTAL :£568

Does any one have anything against components that i selected?
Any advice appreciated.