Hi all you mixte fanatics, I need some help. There is a beautiful mixte here for sale and I'm really interested in it. I test rode it and it felt a bit too small-- I would have wanted the seatpost up an inch and a half or 2, but the seatpost was already at its max. How difficult is it to make a mixte bigger? The stem that is on it now seems a little short too, so I could probably get a taller one.

I'm 5'7" with a 31.5" inseam. Here's the bike:

http://madison.craigslist.org/bik/649355029.html

I really want it and am just looking for some reassurance that it's not a bad idea!