With the radio equipment you presently have it makes sense to stay with it, especially 6rx's. Other than the shareing time part another GREAT feature of the JR Spektrum is the model match. That prevents you from attempting to fly the wrong plane The Tx has to be bound to a specific aircraft and will NOT function with any other. Of course there is a 20 plane memory but each has to be bound individually to the TX. Replacement rx are costly about $90 for the AR7000 . I suggest you check the 2.4 equipment out just to see what is going on. You surely can do fine with what you now have but just for curiousities sake take a look.