Is it possible to keep your current PC and also get the Macbook Pro? That would be the best option. You can always return it or at least sell it and take a loss of a few hundred as the worst case, personally I think it is worth it, you learn what OS you prefer and can stick with that for the rest of your technical days.

With the PC it sounds like what you got, I don't think Apple has anything that would really stand out to you other than their User interface.

On the bright side, you have at least a month more to think about it as Apple(as well as other computers) are going to be releasing 2012 computers with Ivy Bridge Processors that are going to have a lot more horsepower than the current generations.