Since sailplanes are frequently more "special purpose" than other airplanes, questions you should answer are:

1) Do I want to thermal soar?
2) Do I want to slope soar?
3) How strong is the wind where I'll typically fly?
4) Will I want an electric motor with folding prop?
5) Do I want to hand launch or "string launch" (aerotow, hi-start or winch)?
6) How fast do I want the sailplane to fly?

Fly safe, Glover