Do you have options to hold each one of them? You have to like the way it feels above all else. Plus which one do you have access to extra RX's and parts? I'd choose by those two thoughts first everything else second.

What kind of vehicals do you have/get?

DX3R- looks cheap but it's actually very good. No backlite that does suck
rx being lipo ready is pretty darn cool but only a problem really with nitro vehicals. Most electric esc's are lipo ready.

Futaba 4pk- The overheating problems that i have heard of seen to come from having the RX foam wrapped and enclosed in a 1/8 rx box during the middle of summer. I've been running the FASST system since it came out and have had zero problems.
Comfirmed 1/2 mile radio range. By me and nic case(holder of the world's fastest r/c car record).

M8, M11, M11x- used by some of the best racers in the world. Who can argue with that.

Good Luck.