Wow. Congrats! Looks like win-win choice no matter what.
I'm not a PT, but an OT, and I found that graduating from a small-name school had very little influence on where I worked or what I did once working. Especially now - it's a therapists' market - you will be able to get a job anywhere as long as you have a license and degree.
My hesitancy would be, in hindsight, two-fold. If you are absolutely certain that you want to be an academic, in which case you might wanna go with Columbia, and you'll feel more comfortable with an Ivy name to swing around when you talk to/send resumes to others. Also, when you go somewhere with an academic medical center attached, you get a rich and broad exposure. And Columbia is simply unparallelled in that aspect (and that's coming from a guy who is currently at Stony Brook). You see cases you won't see elsewhere. BUT - check out the salaries. There have be postings all over about how much you make, but even if you are very generous in your estimation of first year pay, figure out how long it will take to pay off your DPT with 80 or even 100K/yr.
Lots to think about, but congrats and good luck with whatever you chose!
dc