Thanks! Them UPS's aren't the cheapest of things, but I suppose if I'm dropping eur3000+ for the new system, an extra 100 or so won't make that much of a difference. And I won't have to worry about my lovely new system being fried by an unpleasant power spike, either. I'm looking at this one:
APC UPS, because it seems to be nice and basic. I don't want to spend a load of money on fancy features I'll never use.