Which power supply do I need?

I'm thinking about buying these items:

CPU:

http://www.overclockers.co.uk/showproduct.php?prodid=MY-114-CR

MOBO:

http://www.overclockers.co.uk/showproduct.php?prodid=MB-101-GI

RAM:

http://www.overclockers.co.uk/showproduct.php?prodid=MY-114-CR

How much power would I need for these? (I'm running a fairly old 512MB ATI RADEON graphics card, but will probably upgrade to a new GTS, and have a 250GB SATA MAXTOR drive to boot from, and will probably buy a 500GB Western Digital drive for data storage)

Aith that in mind, how much power would I need, and what would be a good brand of power supply for me?

I'm looking for the cheapest option really, but not something crap, and want to buy from overclockers UK.

Thanks alot.