Having owned 4 Libelle I would happily say it is a good first glider. If you can fly a Pegase and LS4 then you should be fine
8,33 radios are mandatory in Europe so assuming you are there then yes, you will need to invest. There are limited supplies and waiting times at the moment. Some shops still have 1 or 2 available. Prices for new ones start at €1000 and go up from there
Flarm is not as bad. €300 for an old version, €500 for something better and €910 for a new powerflarm
Just my 2 cents worth
Cheers