Mac Mini: A windows alternative?

So here's the deal, I'm considering upgrading my old Dell Studio PC, its large noisy and generally a pain. I don't need anything exceptionally powerful, HD movie playback something to handle keeping MANY tabs open, music playback and just the usual sort of stuff. The Mac Mini's hardware is appealing because of it's size and superb design, while packing a decent punch. I am however invested in Microsoft Ecosystem and using Mavericks doesn't make much sense. I know I could use Windows 8 through bootcamp but I was wondering if anyone knew of any Windows hardware to a similar effect.

I'd love to just get an All in One, something like the Sony Tap 21 though that's outside of my price bracket. We're talking £400-£600.