Which RTF to start with?
The Firebird is a great idea, that how I started just a year ago. Now I have 15 planes, electric and glow.
The problem with the Firebird is the lack of elevator and it's ability to turn quickly. However, a 2 channel bird is not a bad idea for a beginner. Also, you can't transfer the Tx to another plane, as stated.
In the end you'll end up moving on, and have to buy a new Tx along with a new plane.
If you're looking to get someting up quick, but will be a toss away, go with the Firebird. If you want to buy equipment you can resuse, and want ot learn on 3 channel planes go with my recommendations above.
Dave