I just checked out the ad and Yeah, I kinda like that 830. It's a 1987. Full CrMo frame, double butted main tubes. As neo says, it'll be heavy with all stock parts but I think those still ride sweet.
If the 87 is like the 1986, then 57.7cm TT is pretty long in the 18" size but both the 20 and 22" only have a slightly longer 58.2cm.
Also mentioned before are the way slack angles. A zero setback seatpost will put saddle more over the BB and shorten reach a bit.