All of the radios out there are of good quality, so the brand is up to you.

If you are going to be flying at a regular flying field, I suggest finding out which BRAND is being used by the majority of the people there and then get that brand. I would also suggest finding out which are the LEAST USED channels and get the radio on one of those channels (minimizes/eliminates waiting time to fly )

I suggest a 6 channel radio. You will not be using the extra channels and/or functions INITIALLY, but by your 3rd plane you will be wanting many of the functions and most likely the extra channels (flaps, retracts ). A 6 (or more) channel computer radio should last you for years.

I also suggest a computer type radio. This will allow you to store multiple models in memory and have features such as trim save, expo, etc. The major thing will be your flight packs. You will need lighter weight receivers and servos for electrics than for glow powered planes.

Depending on your individual situation, you may want to investigate the Polk's Tracker III radios. They can transmit on ANY channel using ANY brand/shift receiver. The Seeker receiver can be used on ANY channel, ANY shift, by ANY brand of transmitter. The only negative (depends on how you look at it ) is that the radios only come with one servo. Here is the link if you are interested:

http://www.polkshobby.com/

FWIW - I have a Tracker II and really like the radio. I have not used my Futaba 6XAS since I got the Tracker (that reminds me, I need to go charge the batteries in everything

Hope this helps.