I agree with Eurisko 100%. I have a MacBook at home, but here at my internship I was forced to run a Dell XP Laptop. I have never used a Windows system until now, but it seems pretty stable and is most certainly cheaper in cost/efficiency. Organize your financial situation, and then get your bang for your buck. If you want to change your completel user experience, then go for the OSX system.
If I were you, I would play with a friends Mac and see if you like the interface, and then check your financial stability and go from there. Please update with what you choose.
-After the rambling, I support Mac 100%.
Reako