Gigabyte GA-MA790XT-UD4P 790X Socket AM3 DDR3 8 Channel Audio ATX Motherboard - £94.45
Corsair 4gb (2x2gb) Ddr3 1333mhz Xms3 Memory Kit Cl9 (9-9-9-24) - £80.79
AMD Phenom II X3 720 2.8GHz Socket AM3 6MB L3 Cache Black Edition Retail Boxed Processor - £89.99
Arctic Power 700W PSU - With PCI-E, 4x SATA, 20+4, ATX12V, 8pin +12V Connectors - Retail Boxed £40.99
PowerColor HD 4870 1GB GDDR5 Dual DVI HDTV Out PCI-E Graphics Card £102.42
Total : £408.97
And these are prices taken straight from ebuyer, so you can probably get the lot cheaper if you shop around, however most of the parts are top quality and the motherboard is pretty good, iv got it myself and i cant reccomend it enough, its also crossfire so you can add another gpu, also dont forget this system is DDR3 and the GPU is 1gb as supposed to being 512mb, the Phenom X3 720 is also an excellent overclocker if your planning on going down that route, because of the unlocked multiplier even if your not the stock clock of 2.8ghz should be more then high enough.
I hope that helps, let me know how it goes
