Thanks for the replies so far. Interesting point about the software being run, because apart from FS9, I don't do any gaming on the PC (don't do any other gaming at all in fact!) - it's used mainly for audio/video/photograph editing, plus typical office-type applications and website maintenance. The vast bulk of the software I'd use on the new PC would be the same stuff I'm using now. So the only reason I've got a graphics card is for FS9!
Maybe I'll ask my local shop to build me something based around single-core 3.0GHz (or better if available), 2Gb memory, a 512Mb card - and XP. Might even get reasonable performance if I ever find a cheap copy of FSX - that's how I graduated from FS2002 to FS9 in the first place.
Reasons for still preferring XP (apart from the horror stories you read here and elsewhere about Vista) is that each new iteration of Windows seems to be increasingly power-hungry, and it seems to me that XP does everything I need without losing more processing power and memory just running the OS.
