RE: Crash and burn!!!!!
You should have 2 nice radio systems, JR Quattro and Futaba 6EX, both with full flight packs (4 servos each, switches, receiver batteries, and receivers). You should also now have an Evolution TPS .45 BB engine and your Magnum XLS .46A. That's a pretty good stockpile of engines and flight equipment to work with.
There are several .40-sized trainer ARFs on the market that can be assembled with little-to-no building required. The Global RCM trainer, available from Tower Hobbies or Hobby People, is one such plane that is almost completely prefabricated. Another trainer designed with this level of complete prefabrication is the Thunder Tiger Tiger Trainer .40 MkII.
The control surfaces are already hinged, and the plane simply needs to be pulled out of the box so the wings can be screwed together and the tail assembly bolted on. After that, you simply install the engine and radio equipment and you can begin your preflight checks. Both of these planes retail for about $120. They're a bit more than a Nexstar ARF, but can be ready to fly more quickly.
There are also some excellent traditional trainer ARFs available for $69.99 to $79.99 in price like the Hangar 9 Solo Sport/Solo Star, the Seagull Models Arising Star, the World Models Sky Raider Mach I, the World Models Super Frontier .40, The Tower Hobbies Tower Trainer .40 Mk II, The VMar Discovery .40, and the Vmar Challenger .40
You can buy a largely prefabricated trainer ARF like the Global RCM trainer or Tiger Trainer .40 MKII to get back in the air as quickly as possible. If you like assembling your ARFs and appreciate the building experience you gain, you can buy a good $69.99 to $79.99 trainer airframe and save yourself some additional money. In either event, your existing engines and radio equipment should be usable. You will need to thoroughly check out your receivers and servos to make sure that no crash damage occured.
Crashing your plane is very disappointing, but you simply have to accept that crashes are part of the hobby. Every crash is an opportunity to learn more about repairing and maintaining your models, and while you shouldn't greet crashes with enthusiasm, they do help you grow and improve in the hobby.
Whether you repair the Nexstar or build a new ARF, spend some additional ground time with your flight instructor (or any experienced builder) overseeing your build/repairs and ground checking your plane thoroughly to assure that your next few flights are trouble-free. Good luck!