Shaun,
Apple are introducing a low-cost version of the Mac, which is basically just the processor box. Excellent option if you already have a decent monitor (of course you'll have to check with Apple if they support your monitor). Not sure if a keyboard and a mouse are included in the package - I don't suppose you can use Windows-compatible devices - also not sure when they become available.
And for those who comment on the superior quality of the Mac screen, well, that's exactly what it is: superior quality. Most Windows computers simply have inferior screens and video adapters. That's one of the reasons why Macs are so expensive.
This coming from a 100% Windows person ... but for my thing, I'm not sure Apple has anything to offer that Windows is lacking. (Let the flaming commence! LOL)