We have the 700c (28") model, and we can get a 700x35 tire on it, but not with fenders. 32mm is probably the max with fenders. Santana put 700x28 Conti Gatorskin tires on as original equipment, which I thought were too small for a triplet.
The Co-Motion Periscope mentioned by Tandemracer is also a really nice bike to consider.
Personally, I wouldn't be too keen on disc brakes on a triplet, preferring our v-brake and Arai drum setup for redundancy. Be aware that it's not a simple task to swap out the 1-1/4" fork on a Santana for a disc-compatible one, as it's a non-standard steerer size.
The only difference between the 10-year-old version and a new one is basically moving from 9 to 10 speed. Ours is a 9 speed version (we bought it new, but as "old stock"), which I'm perfectly happy with, so I wouldn't worry too much about that.