Hi guys. First post so be gentle 
I am going to build my own PC, (for the first time).
These are the specs i have concluded with so far:
Motherboard: Asus M4A785TD-M Evo AMD 785G (Socket AM3) PCI-Express DDR3 Motherboard
CPU: AMD Phenom II X2 545 3GHz Socket AM3
RAM: Crucial 4GB DDR3 1333MHz
GFX: XFX ATI Radeon HD 4850 1024MB GDDR3 Dual DVI
Case: Akasa Genesis AK-5004 Midi Tower Case (plus an extra 120mm cooling fan)
Hard drive: Maxtor 250GB
DVD +- RW
OS: Windows 7 home premium.
My question is what wattage power supply do i need? I was looking at this PSU: http://www.overclockers.co.uk/showproduct.php?prodid=CA-037-OC&groupid=701&catid=123&subcat=
But is it large enough? I dont know how to work out what size i need.
Any tips and suggestions for my system build are very welcome!
Thanks

I am going to build my own PC, (for the first time).
These are the specs i have concluded with so far:
Motherboard: Asus M4A785TD-M Evo AMD 785G (Socket AM3) PCI-Express DDR3 Motherboard
CPU: AMD Phenom II X2 545 3GHz Socket AM3
RAM: Crucial 4GB DDR3 1333MHz
GFX: XFX ATI Radeon HD 4850 1024MB GDDR3 Dual DVI
Case: Akasa Genesis AK-5004 Midi Tower Case (plus an extra 120mm cooling fan)
Hard drive: Maxtor 250GB
DVD +- RW
OS: Windows 7 home premium.
My question is what wattage power supply do i need? I was looking at this PSU: http://www.overclockers.co.uk/showproduct.php?prodid=CA-037-OC&groupid=701&catid=123&subcat=
But is it large enough? I dont know how to work out what size i need.
Any tips and suggestions for my system build are very welcome!
Thanks
