There are any number of pros and cons for both Macs an Windows-based machines.
My first recommendation for you would be to check out the computing requirements of the program you are entering. No sense of buying a Mac if you're going to have to shell out for a PC down the road, or vice versa.
If that's not an issue, then you next need to get past the 'weird change' factor. OS X is different from Windows, yes, but it's not like you'll be in completely alien territory. A little playing around, some time spent in the Mac environment, and you'll be comfortable enough to be productive. Then you just take time to learn the tricks. Finally, if that's not enough for you, your Apple notebook can run Windows.
Interface aside, OS X really is a better operating system. I credit it to the fact that Apple builds the software to run on Apple hardware. One company responsible for both. This means that Apple computers are specifically tailored to run OS X, and the operating system is optimized to run on Apple hardware. Now compare to Windows and the millions of hardware configurations that may or may not run that operating system.
As for affordability, the Education discount is your friend (back to school iPod deal even better), and similarly spec'd Macs and PCs are so close in price that the slight difference is worth it. And if that's not enough, check out the refurbished machines on the Apple site (though no free iPod with refurbs).
As for me, I switch back and forth between my MBP and my 6-year-old WinXP box on a daily basis, as well as the PCs on my university campus and student lab. I'm completely comfortable in both environments. However, when my PC desktop finally kicks it (or just can't keep up), it will be replaced with a Mac.