Spend your money on a good motor and radio and go a little cheap on the trainer. Most basic trainers out there will do a good job for you.
Trainers do get beat up but the gear in them usually survives for several planes to come.
I like the Sig LT 40. I also like the LA series of bushing motors. The 45 is a good choice for a "40 " size trainer. the 40 is sometimes considered a little weak for some birds.