I have the Spectrum DX7 transmitter, have owned it brand new from Horizon, for 1 year. It has performed flawless.
I recently switched to the JR 9503 Transmitter, that way I can still use the Spectrum RX's.
Remember, when buying a transmitter, you are more comitting to that brand of receiver, IE: Futaba, Airtronics, and others.
Receivers are not cheap especially in the 2.4 MGZ area. Look at the radio, hold it, use it's functions, then decide.
I am knocking any radio, but it's your decision. Personally I like the JR radios, many more features like model match, and model memory than Futaba.
I am going to list my Spectrum DX7 on RCU for a great price, because I bought the JR 9503. I also am listing some Spectrum RX's , AR7000's about 5.
Anyway good luck with you decision.