NigelPocock wrote:

There has been a lot of discussion in our club recently about what makes the
ideal training glider

Reading through your list, I would say that you're looking for a DG
1000. It fulfills all points except the 300 lb requirement, but I guess
you could arrange even this with the manufactorer, as I doubt the 110 kg
certification limit is the structural limit. It isn't cheap, though.

* must be capable of spinning

I fear this will start a whole discussion on its own, as always, when
this point comes up. Personally, I think a primary two-seater trainer
not only should be capable of spinning, but it should be *prone* to do
so, so the student learns early (and with an instructor in the back
seat!) how to avoid and handle spins. Much better than getting checked
out in an ASK 21 and then being surprized by the first spin in a single
seater, as I did. But there are exactly two opinions on this.

Stefan