what psu do i need?

I think my computer is underachieving as my PSU came with the case. I dont know how powerful it is but I think its crap as it came with the case anyway my pc components are:
processor : AMD Dual core 6000+
RAM : 2GB
HD : 500GB
Graphics card : 7950GT
Sound Card : Sound blaster Fatal1ty
CD Drivers : 2 DVD r/w
And speakers with subwoofer

How much of a PSU should I be looking at? 400? 500 or more?

If so could somebody post links to a decent psu, i'm looking to spend about £60 , could push it abit more

Thanks!!!

 

400W 18A for a single card or 500W 28A for SLI. Pick out a tier 1/2/3:

http://www.xtremesystems.org/forums/showthread.php?t=108088

 

Importantly is this just for the current system or do you intend to use it for a future build as well? This will define what sort of plugs you want (e.g 2 x pci-e (6) or (6+2)) etc.

That is a good list and for 60 pounds you should get something decent, I don't know any good English online retailers to have a bit of a look for you but if you list some will be more than happy.

 

By the way, if you overclock, you'll need a bit bigger psu than recommended.

 

I don't plan to overclock and no I dont intend to upgrade the pc for a while, when I do i'll just get a new psu.
Thanks for the help