I built a Portland before there was a Portland and am waiting for Trek to send me royalty checks...
Bought a gently used 1999 Trek 7500 and proceeded to strip all the stock parts and build it up into a very capable all rounder... since I don't live in Portland but just like to visit did not see disc brakes as being essential and am really happy with the XTR cantis.
I could echo tsl's comments on his Portland when it comes to performance and versatility, mine is geared a little low for brisk road rides but it really excels when it is pulling large loads and going off road.