I haven't really bugeted for a monitor - my current one works perfectly well. If I bought the Samsung 21" I'd use up £352.49 of my budget!

EDIT: Thinking about this...

Case & PSU
System board, CPU & RAM
HDD
Graphics Card
DVD+/-RW
Card Reader
Total: £620.31

Not sure what else I might need, though. It looks like the case comes with enough fans and I imagine I'll need some sort of modem? Thinking of going wireless, actually, don't know what I'd need to get that done.

One bonus of all of this is I'll finally be able to clean-slate my existing PC and set it up with Linux and finally learn my way around it.