Just a quick note about the Macbook Pros... they are currently overdue for a refresh, so the price/specs right now are pretty poor. I'd imagine the new ones are out in the next couple of months with better specs, making it a better value (although value wise, PC is the way to go).
That is if you are thinking of the macbook route. One thing to think about that made my decision to switch MUCH easier. Bootcamp. I have windows 7 and osx loaded up on my macbook, best of both worlds!
In general if you are looking at buying ANY apple product, check this page out first. Measures the average refresh cycle for all their products.
http://buyersguide.macrumors.com/