Hey, $80 for a bike that has 105 on it is a score. So good a score that it might be worth checking with your local police department to see if it was stolen. (Perhaps you have a really nice friend that gave you a screaming deal)
Its not a top of the line bike, but it was in $1,400 range new.
Check out
www.bikepedia.com to find info on just about any bike. Select a year, make and then model.
Good luck.