Welcome to both Science and Pilgrim. RCU is a great place and you'll get soem terrific advice.
The LT 40 is one of the best trainers on the market. There are others that are equally good, and most trainers fly pretty much the same, so you'll get a LOT of different opinions. (People will usually recommed the trainer they learned on.

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I'm a club instructor and have flown many of the "generic" or Off Brand trainers, and they all fly pretty well. I've also flown the PT 40, the LT 40, the Nexstar, the Superstar, and a few of the other "Name" brands, and I like the LT 40 a lot.
A 46 is a good choice because it does provide enough power for aerobatics when you're ready, and enough power for that second "sport" plane. I'd recommend the OS 46FX, the Thunder Tiger 46 PRO, or the Evolution 46 (45?).
I also highly recommend finding a local club and an instructor. It will make learning a much better experience, you'll learn more quickly in the long run, and it will very likely save you money because you won't crash. (Or it's MUCH less likely at least.)
Good luck and have fun.
Dennis-