If you want to stay compatible with your existing Hitec receiver(s) then you need to stay with Hitec you get Futaba. Have you looked at the Hitec transmitters at
www.hitercd.com? Have you looked at the Futaba transmitters at
www.futaba-rc.com? You should consider whether you will only want one more channel for the foreseable future, or more. Buying a new transmitter each time you want to add one thing will get expensive... Are you only going to fly one model with the transmitter? The lower end computer radios (~$200.00) all have multiple model memories... Lastly -- have you considered buying a used transmitter? The last Futaba T6XA that I sold went for $90.00 and it was in perfect shape...