oh man, yeah that's tough. Going through the same thing here...been accepted to three, still waiting to hear back post-interview from my top 2 choices, and still interviewing.
For me, ranking has been somewhat of a huge chore. First of all I base it on WHERE I FELT BEST, you know, what school just felt like "it", the place I would be happiest and do well. I believe that that should be like 75% of the decision because come on, if you aren't comfortable and happy, you won't do well no matter where it is. After that, to me the next factors are COMLEX pass rates, residency match rates (mostly, how many students get first or second choice), and also clinicals, like what hospitals are affiliated, do you have to move...can you stay in the area...etc. Also really important for me is curriculum. For example, a huge turn-off for me at a couple of schools is the MANDATORY class from 8-5pm EVERY DAY FOR TWO YEARS. Sure I'm fine with going to class and for the most part even enjoy class, but seriously, that seems a little anal. Everyone has some times when you just need to skip for any number of reasons. I don't need to be treated like a kid, I can do well without the school keeping attendance (hell, maybe they'll even start giving detention). Plus, when I interviewed at those places, the students seemed more stressed and they felt like they had a lot less time. class 8-5, eat supper, study 4 hours and its already 10-11pm. When is the free time (i know i know its MED school, but you have to have some time)
SO, I'm looking at some PBL and also at the schools where there is a mixture of class and lab from like 8-2 with some workshops where the majority of classes aren't mandatory.
Finally, location comes into the picture a litte bit, and then finally, money. It's gonna cost a ton no matter where, so I will pick the best school for me, regardless of price. However, say I really LOVE two schools and would be great at either and the price is like $10,000 a year difference; THAT is enough of a difference to consider price.(hell thats $40,000 total, and is basically the tuition of an entire additional year!)
Sorry for these ramblings of a tired and stressed guy waiting for word from my favorite 2 schools

but this is seriously how I am breaking it down. Good luck! feel free to PM me