Remember how I defined the term for this discussion. The Texel rating for 1-Up with main alone needs to be close to the rating for 2-Up with main and jib. That said, I don't know what the Texel rating is for a 1-Up Mystere 5.0 XL.

Looking back on my notes, I think I misspoke. The Mystere does seem to be a good boat for my purposes. It's on par with the Nacra 5.0 (about the same weight, but a little more sail area.) Like I said, if the one I found had been in better shape I would have bought it.