It really is just personal preference. I use a Futaba 6XAS (predecessor to your radio) and it has 6 model memory. I currently have 4 flyable planes and one on the building board.

I did buy a Hitec Laser 4 system to get the flight pack for my second plane. I've tried to give the transmitter away but no one in the club wants it. After that I decided to buy flight packs to avoid building up a pile of transmitters that will never be used.

Hobby People sells a Hitec Flight Pack (that meets most of my needs) for $99.99 plus crystal. It goes on sale fairly often for $89.99 plus crystal. It comes with 8 channel receiver, 4 ball bearing servos, switch harness, and 600 mah battery. Add a standard servo for throttle and it is ideal for the 40 to 60 size trainers and sport planes I like. If you need micro or mini stuff, or need upgraded full size servos, it is not for you.

Servo City lets you "build your own" Hitec flight packs, and the price is usually a little cheaper than buying the individual parts. You do have to shop carefully though, as it's not always cheaper to do it this way. And, you have to want Hitec receivers and servos. Other vendors may offer the same thing, or do it with different brand product.