An alternative option, given what I remember from my medical school days, for a similar cost would be an ipad and MBP. Most of what you might consider for what you need to do on a portable device in medical school could probably be done on an ipad, however in those cases that you need to do more than just basic stuff, I think a macbook pro would work better. As you'd probably need the CD drive, as given how backwards things in medicine still are, you will need to use a CD or even possibly (if they've advanced so far) a DVD at some point for slides, or othe things. The good thing is that at the last allergy conference I went to, they finally started distributing stuff on flash drives instead of CD/DVD. Alot of stuff will still come on that format for a while. One of the most useful, Uptodate is availible on DVD or web access, but not as a native iphone/ipad app yet. This is my current recommendation based on the current specs/cost/practicality and usefulness for a student. The cheaper option is to go straight for a macbook pro obviously. I'm going to guess that you'll carry it around to lectures, and to the library to study. Most of medicine is still studied out of books. There are definitely medical texts that are availible in electronic format, ie harrisons etc, but reading them is still not going to be great on a laptop. An ipad will be nice in this case. When you have to carry massive text books, it's pointless to discuss 1.5 lbs lol. You might find yourself not bringing any laptop at all and going with the ipad for occassional email, web look up or something while you study.
As for running windows, I would go ahead and get windows 7 pro now, and use bootcamp and virtual xp if you really needed it now. This obviously would run alot better with 4gb of ram like on the pro. I initially bought my first macbook with the intention of running windows in bootcamp mostly and mac os occasionally. Upon use, it has become the opposite, and I mostly stay in mac os and occasionally boot windows when some random app calls for it that has no mac equivalent.
When you finally hit your clinical years in 3-4. You can forget about bringing a laptop or ipad with you. Those scrubs do not have any room to store anything, and stuff is easily stolen. It won't matter if you have a ipad, macbook air or macbook pro then, most of it will sit at home in the 80-100 hours a week you're doing some of your rotations. The only things that will help you at that point are things like an ipod touch (hey free with current back to school offerings) and an iphone, which I think even more than a macbook or ipad would be the single greatest device you could own in the medical profession, bar none. I use it every day basically, ie looking up medicines, referencing materials and documents I need, heck storing my DEA number and license numbers.
That's the 2 cents from someone who finished medicals school, residency and is now a fellow.
I'm sure others will post soon to decry my post and say how stupid this is, and how much better a macbook air is. Don't get me wrong the macbook air is a sexy machine. I considered getting one again before I purchased my 3rd 13 inch macbook pro + ipad recently. I do blame apple for not updating it sooner for making my choice for me. But if you want the opinion of someone in the field, then this is my current recommendation unless they A. make the macbook air lighter, more powerful, cheaper. Which is unlikely. You want to make sure you have an iphone over any of these things.
Enjoy your first 2 years, sadly it's alot like college and highschool, but it will be the last time you see regular vacations and holidays for looooong time.