Hi Clunk, yeah the power supply is the standard 300w. What would i need to upgrade to? Im new topc upgrades so sorry if im asking simple questions, good news though i can now run crysis on High settings and stalker at pretty much max
Well glad you're happy with the card - told you it was the business
Right the first thing with PSU's (you aint gonna like this) is don't buy cheap. "Value" PSU's are usually well below their stated wattage and are far more likely to be noisy/have a short lifespan. As well as sellers' own value brands, also avoid cheap name brands like Sumvision, Winpower, etc.
Next, it depends what your plans are. Can you see yourself doing any more major upgrades to your PC? You've done the graphics card - this and the processor are the two biggest guzzlers of power in a machine. If you're going to be happy with your HD4670 card for a long old time, then really a good brand 400-500W PSU will be plenty for you.
You would only need to go any more than that if you're likely to upgrade to a high-end graphics card or change your motherboard and go SLI/crossfire (two graphics cards running in tandem), or upgrade to a very power-hungry CPU.
For your system as it stands, and still allowing for basic upgrades (additional drives, RAM, PCI card or additional USB devices), a decent but affordable PSU is the Hiper 4S425. It's rated at 425W (but has a maximum output of 495W). Ebuyer, Aria, Scan all do this model for about £20-25. I've used a couple of these in new builds and they are just the job. Typically though, I've just checked a few sites and they're out of stock!
If any major upgrades are likely in the future, then look for a 500W+ power supply by a good manufacturer (eg Corsair, Antec, OCZ). You'll be looking at £40+ for these, but it's an investment in the health of your PC.