Something no one wants to point out, to busy recommending their favorite trainer/plane.

STOP.. think about where you want to go in this hobby. Are you staying in the sport range, Going to warbirds, Jets, Multiengines???
this can and should effect your decision on what to start with. If you are planning to be real serious about the sport, start looking for and talking to different instructors. Watch what those intructors fly. You dont want to get an intructor that cant teach you anythg past the sig senior, slow and easy, if you want to go scale or jet or both.
If your going to get larger planes get the larger trainer With maybe the engine that would be used on your "next plane" if your have those plans. Get at least a 6channel of more if you can invest in it. If not Your next plane w/ flaps,retracts,etc won't fit on that 4ch and you have to buy it anyway. Almost any modern trainer on the market(and sport plane mentioned) you will be able to be tought with. The Quality of the intructor will determine how long you keep that plane. So pick your instructor, It's your choice, If the field won't let you, find another field.

THINK ABOUT IT?
Some of these planes are thousands of dollars, You wouldn't buy any car that some one wanted you to?

Good luck, You'll love the hobby
brian