One thing to remember when making your decisions. Yes, you can have multiple models on one radio, but if that one radio has a problem and you need it repaired, you won't be flying until you get it back. I have two right now a JR662 and a JR8103 and can add any of my planes to either unless I need the full 8 channels that the 8103 provides. I learned the hard way when I had to send in the 662 twice and sat and watched others fly till I got it back. Wasn't long before I had the 8103 as my primary radio and the 662 as the back up. I will say this is not an everyday occurence since most tx's are very reliable, but if you can afford it, you can avoid the problem altogether.