The 430cx is great, but what are your parts and neAR future up grade plabs. 430W is barebly cutting it for a dedicated modern gpu. So if you plan on modifying, buy a bigger psu. Well corsair are da bomb.. a 5-550W psu in the £50 price range is smarter.
Well, seems youre bone in the UK....... My best suggesting is Corsair 500W CX PSU - 5x SATA 2x PCI-Express | Ebuyer.com
at 46.99 But it has many advantages as it has 2 pci-e cab;les, which alot of gpus are starting to need. Plus a couple extra cables.