First PC Build on a very tight budget

[joecarver]

Approximate Purchase Date: This Month

Budget Range: £200

Country: UK

System Usage from Most to Least Important: Basic home use, light gaming

Parts Not Required: (KB/Mouse, Monitor, HDD, Speakers, Graphics Card)

Preferred Website(s) for Parts: novatech.co.uk, dabs.co.uk

Parts Preferences: No preference, just best value.

Overclocking: If necessary to save money

Monitor Resolution: 1440x900

 

[joecarver]

Someone must be able to give me some advice on what's best?
As in should I allocate more money on a good motherboard or a faster processor?
And how important is it to have a very good PSU.
Thanks