The lightest 4 channel full range I know of is the Berg Micro-stamp. It's only 7 grams. I use the Berg 5's which are about 15 grams with case for my Quickie planes as well as all my electrics. FMA has the Extreme 5 which is also an excellent Rx in the same weight range as the Berg 5 channel. A cool feature of the Berg 5 channel is that the 5th channel can be assigned to respond to either channel 5 or channel 6. Most computer radios use channel 6 for the second servo of dual aileron servos. It comes in real handy.
I wouldn't trust any of the GWS rxs or the Hitec Feather. They have proven prone to glitching at congested flying sites.
basmntdweller