with most brands, it you want a standard RX, standard servos and a standard battery... the full 4-channel system is the way to get it. That extra TX and the charger turn out essentially free that way. Some basic 4 channel sets, you can specify upgrade servos and/or a different RX... and still be cheaper than the separate items... so its always worth investigating.

As above... if you don't need the extra TX... its a great donation to the club as a buddy box. If its a Futaba... you can keep the TX battery and have a spare for your better TX