Just think, what would you want your girlfriend to get you for Xmas?
Nothing that would arouse my wife's suspicions.
You should also know that a car transmitter (the radio you hold) is different from an airplane's. Legally, they cannot use the same frequency range, and an individual cannot change the transmitter's frequency (also by law). So that means a new radio, too.
But you're still better of with a trainer airplane ;-)