My vote is for the LT-40 also. Or really for any ARF trainer. The 6EXA radio is more than you need now, but you will be glad you have it for your next plane. If you can afford the 9C, that would be good also.

One of the problems with the Nexstar (and all RTF trainers) is the equipment. The 4 channel radio is fine for the first plane. But when you get your 2nd plane, you either have to get a 4 channel plane, or another radio. My Ultrastick has 2 aileron servos and 2 flap servos. The 6EXA is the minimum radio to be able to use all the features of the Ultrastick. Sure, you can build it with strip ailerons and use a Y on the aileron servos, but then the plane does not live up to its potential.

So get an ARF trainer and the best radio you can afford. Get help setting it up (bring the book for the radio to the field with you).