Re:
Going by the colour and graphics I'd have put this one down as a 1990 model. I doubt that fork is original as all the ones I've seen in this colour scheme have a black rigid straight blade fork. There's a couple of these frames on eBay ATM. It also has non low profile xt canti's by the looks of it so that would tend to date it earlier than 92 (if they're original of course).
I had a 92 Peak which was purple and black, see link in my signature for pics.