If you can afford it and intend to stay in the hobby it doesn't hurt to have the better radio gear. It will be good for many future models.
The trainer itself? Cheap is ok, like the tower trainer Ken mentioned. That will not break the bank and leave you some toward your second plane.
Myself, I went with the SIG Kadet Senior (I did the kit but the ARF is good too) a great flyer and when I am done training it can be a work horse (for towing sail planes, camara carrier, ect...)