First glider Nimbus 2 ?

Ultimately, it's still your own decision what you buy, and depending on your skill, your club or CFI might allow it.
At our club, we have some pretty high demands. In order to fly solo on our Duo Discus, you need 75 hours solo, LS4 is 40 hours. If you were to buy something like Std Cirrus, Libelle or LS4, you need to have flown over 40 hours and at least 5 flights with the clubs LS4's. If you were to buy a flapped glider like Mosquito, PIK20, Mini Nimbus, you need to be solo on our Duo Discus (so 75 hours solo flight total) and flown at least 5 flights with a flapped glider in double with an instructor. Since we don't have a flapped glider owned by the club, there is a private Arcus owned by an instructor who you can pay to train.