+1 on vintage MTBs as they run fat tires with lots of room for fenders and most have a good selection of braze- ons.

Next week Bikeworks co-op in Columbia city is having their warehouse sale you might want to check that out or go to their warehouse most any Saturday (check their calendar) as they usually have a selection of project bike if your willing to do some basic maintenance you can find some good deals heck I even lucked into a Trek 520 there a few month back so you never know.