Well youve come to the right place.
This question has been done many times so you could just do i search on trainers and youll get tons of info.
Firstly the way it works in most cases is you buy your ARF (almost ready to fly) plane then you get your engine and radio systam seperate.

I can also see your interested in an ARF and all that you have listed has great reviews and flying capablities. I went with a Kadet 40 kit and it flew great. About the engine and radio you first have to decide how deep and how long are you going to get into this hobby. The TT .46 is a good engine for the price and if you plan to just get maybe one more plane after your trainer i would suggest it. However there are many other more quality engines out there for a little more OS Super tiger etc..
The radio again how much do you want. For just your basic radio with your 4 flight controls the Futaba 4VF is great. Ive seen these go really cheap on RCU i would suggest taking a look.

I also really suggest not to be to hasty. Make sure you know what you want and the price it goes for (You can take a look at towerhobbies.com) Some hobby shops can rip you off.

Anyways hope this helps,

Papa