Building a computer, confused on what Graphics/Power Supply unit i need

[Perad]

Could someone take some time and give me some advice on what power supply unit and graphics card to get.

I am not looking for products, just general specifications which will help me find a good product.

As far as a power supply goes, what wattage would i need? Also are there any other things i need to check before i buy.

With a graphics card i am looking for a 256MB card but prices range wildly from £50-£300. Does anyone have any suggestions for a 256MB card?

MB, Processor and RAM are listed below

http://www.overclockers.co.uk/showproduct.php?prodid=CP-128-IN
http://www.overclockers.co.uk/showproduct.php?prodid=MB-108-AB&groupid=701&catid=5&subcat=174
http://www.overclockers.co.uk/showproduct.php?prodid=MY-090-CR&tool=3

 

[bigbear]

Use the power calculator to help you work out what PSU you need
http://www.extreme.outervision.com/
As for the graphics card it really depends on what you are using the pc for.

 

[Rich-M]

Good all around card would be ATi X1650 or Nvidia 7600 pci express 16.
You probably want a 450-500 watt psu and the only brands I ever recommend are Antec, Thermaltake, Enermax or Sparkle.