The unfortunate thing, nowadays is that Windows over prices their OS. I mean heck you can get just about any Linux OS for free so why bother with Windows? If i had to choose an OS, it'd be Lion OSx, just because buying an Apple product and updating the OS costs about as much as buying a regular new laptop from Microsoft and then buying a Windows OS as well.
Just my personal opinion, but i think Apple's Computer Products are better, and look better. It's all up to your personal preference however. Do some research, use google if you have to. Take your time before deciding to buy a $200 OS.
Avy & Sig credits go to Hurricane0