Total Price including keyboard, mouse, OS and monitor = £473.64
A bit over budget but I can stretch to £500. I'm not at all sure about the Case/PSU and am I right in assuming that the motherboard has intregrated networking? With the remaining budget would some extra cooling go amiss?
For some stupid reason I had next day delivery selected. Putting it back to 5 wrking days means I can afford this monitor: http://www.ebuyer.com/product/155601
by going £5 over budget which is well worth it I think.