Univega made a beautiful Gran Turismo mixte (actually, Univega didn't make a single bike, but that is another topic). Good luck finding one, I have seen one in three years. Miyata made a 210 based mixte as well. If the price is decent on the Raleigh, I would pick it up regardless and enjoy it while looking for an elusive touring mixte. Super Course mixtes are pretty hard to find as well. And as Tom pointed out, its hard to find a 531 mixte.

Early 210s were pretty so so. Later ones are pretty nice. Here's a link to the 1985 Miyata 210M. Cromoly triple butted tubing, canti brakes, it would be on my short list of possible keeper mixtes. They continued to make it in later years, and it got better and better. The 1987 Miyata 215M is particularly nice (I have the standard bike version of this year). I would pay pretty serious money for the 1987 version, if I ever found one.

The 1985 Miyata

http://1.bp.blogspot.com/_whtVpXkKwl...0-h/img086.jpg


And the 1987 215M

http://4.bp.blogspot.com/_whtVpXkKwl...0-h/img134.jpg


Mixtes are hot in the market right now, RED HOT!