Thank you for your advice, much appreciated!
Regarding Hunter - is there anyone out there who went? It would be awesome to get your first hand advice.
Also, is there any option of transferring to Columbia from Hunter?
You really wouldn't want to change postbacc programs in the middle. Reason: a big reason to be in a program (as opposed to taking the courses on your own) is to get a "committee letter" from the postbacc program, and you might not be able to get one as a transfer student.
A committee letter is a recommendation which is written on your behalf by the premed committee of your program, which sums up your strengths as an applicant, quotes from your other recommendation letters, and may comment on how you stack up vs. other applicants in your program. These letters are the norm for trads who apply to med school (most colleges have premed committees), and they are seen as very important even for nontrads, if you attend a program which writes them. (Both Columbia and Hunter do.) However, each school has specific rules which determine whether you are eligible to get a committee letter at that school. I don't know what Hunter's rules are, but Columbia definitely has a rule that if you did more than half of your postbacc coursework outside Columbia, you cannot get a letter from them. (They expect you to ask your previous institution for one, but if you transferred out of that institution, THEY might not want to give you one either.) You could very well get stuck in a Catch-22 situation where neither your former program nor your current one will give you a committee letter, which would defeat the purpose of being in an organized postbacc program in the first place.
Besides, if you thought Hunter was a good place to start out at, why wouldn't you want to finish there? As far as I can tell, it's just as good as Columbia, with the added benefits of vastly lower cost and the potential to earn a slightly higher GPA.
If you want to find out more about Hunter, I have two suggestions for you.
1. There is a separate forum on SDN (not part of pre-allo) for postbacc and SMP students. Try going over there and searching for threads containing "Hunter"--I'm sure you'll come across quite a few. (When I was researching postbacc programs myself in early 2006, I stumbled on SDN during a web search, and I remember reading a lot of positive comments about Hunter then.)
2. Use the URL I provided in my first post to go to the Hunter postbacc student group, join, and post on their site as a prospective student. Ask the current students (nicely, of course) to tell you what they like and don't like about their program. I'm sure you'll get at least a couple of responses, and the information is bound to be valuable because it will come straight from the source (actual students).
Good luck in your premed quest.
P.S. Just realized something important: Columbia might not even let you in, because you've already done a lot of your prereqs at Cornell. Similar to the rule I mentioned above about committee letter eligbility, Columbia only accepts students who have done either none or very few of their prereqs already (they want people who will do the whole 2 years with them, not just come to finish up one or two courses). Judging by your first post, you've probably done the whole first year of Columbia's program (1st year is chem, physics and math; 2nd year is orgo and bio). So Hunter might very well be your only option anyway.