Sigepkev, A model i have flown here in Australia is the OMEI Glider. It is electric powered with 2 metre wingspan, fits all the criteria you request, as per engine shutoff when altitude reached , and able to repower up when altitude lost. For your controller, well finances dictate that, but seeing as Futaba is the most popular in America , you can find reasonable priced 4 or 6 channel radios that will serve the purpose quite well. Hopefully some more of your fellow countrymen will give you further advice on this subject.
I wish you and all your family and friends the very best for the forthcoming festive season, and many happy hours of relaxing flying.
the_madgenius , downunder {Australia}