I just ran out of memory on my 6EXAS and decided to buy a 9CAP off ebay as well. Reason I went this way was: price (72 Mhz with 3 crystals shipped for $140), Expandability (room for the CAMPac module to increase to 14 models or 8 +6 models per CAMPac), and (Modular Transmission in the back), and Features (I think 9 channels will be enough for me).
Curtis