If you're going to build your own, then post a topic in the PC Building section where you'll get more replies from people that actually know what should be going into your build for your budget.

Post with the following information;

What is your budget and currency? (Pound sign does not work normally, use GBP abbreviation)
Do you need a monitor?
Do you need a keyboard?
Do you need a mouse?
Do you need an operating system?
What will you use the PC for?