What is the budget here, £300 or £400? This is between the two since I wasn't sure what you meant, if you needed to get it down to £300 then you could get 1gb Ram only, graphics card is onboard so not great but it will do to begin with and overclocking will never be great here. Something like an Akasa PSU will put you at about £400.
GeIL 2GB (2x1GB) PC5300 667MHz Value DDR2 Dual Channel Kit (GX22GB5300DC) £139.99
(£164.49) £139.99
(£164.49)
Asrock Conroe945G-DVI (Socket 775) PCI-Express DDR2 Motherboard £45.99
(£54.04) £45.99
(£54.04)
Intel Core 2 DUO E6300 "LGA775 Allendale" 1.86GHz (1066FSB) - OEM £99.99
(£117.49) £99.99
(£117.49)
Arctic Cooling Freezer 7 Pro CPU Cooler (Socket 775) £14.99
(£17.61) £14.99
(£17.61)
Sub Total : £300.96
Shipping cost assumes delivery to UK Mainland with:
City Link Parcel Next Day (Delivered Mon-Fri)
(This can be changed during checkout) Shipping : £8.25
Vat : £54.11
Total : £363.32