Last Mac I had was one of those unfortunate all in one 5400s back in the day. It wasn't missed, and I moved into PCs, currently running a rather stylish little Shuttle XPC. However, things move on, Steve is back in charge after the dark days and the Mac is once again a desirable pc. To replace my Shuttle with a modern equivalent would cost £900 - £1000, and that is without a monitor, hence the Mac seems even more attractive. I need to retain PC compatability, and want to do so on the fly, so should I buy an iMac, I would install Parallells in preference to using Bootcamp. But, which OS would be a more usable choice - XP or Vista? To retain the dual memory speed advantage, I would prefer to add only an additional 1gig of extra ram. So would Vista be memory hungry and grab most of this memory? Would XP be the lighter, quicker OS to run in these circumstances? Perhaps some of you guys out there have already tried the above with your white iMacs and can feed back. I appreciate your thoughts. Also, if you think this thread would be better posted on one of the other forums, please advise.