I've had three pc laptops in four years, and all ended up on the scrapheap. I now have an Imac which I've partitioned and it's absolutely brilliant! It's definitely the best of both worlds, and if you partition with bootcamp (free from Apple) you get a dual login screen, so you can easily choose whether to run OSX or Windows. Go for it - you won't regret it! I've had mine for over a year now and would not swap back.
You get brilliant software included with the Imac, and you just need a single XP disk with SP2 to install Windows - I used an OEM version.
My only other recommendation is to go to the Apple website and buy a reconditioned Imac - url for UK is http://store.apple.com/Apple/WebObjects/uk...;nclm=Certified
or go to www.apple.com, select the Store tab, scroll down and find the link to Refurb store. They still have a one year warranty, with a good discount. I've bought a few ipods from here with about 40% off the retail price, and if I'd know about it I would have bought my Imac from here as well.