dont expect for a simple answer, everyone has their favorite brand/model and wont hesitate to tell you.

the above mentioned hitec is a great radio, I have seen several used, marc (AKA RCAdmin) uses one and he seems happy with it.

the futaba 9cap is also a good radio (the one I use) but is a bit more expensive ($389 on tower compared to $274 for a comparably configured hitec on tower) or the futaba 6xas is about $219

all of those redios have multi model memory (able to store the settings for mutiple models) and computer mixing/settings

the two futabas and many JRs are able to do PCM (pulse code modulation) also which is a signal modulation that uses encoded digital information to reduce the chance of interference.
the hitec cant,

the hitec has programmable FM shift that allows it to work with almost any brand RX (except for PCM recievers) so you can fly a JR, futaba, hitec, airtronics, RXs with out a problem.

JR has a selection of good radios, but i dont know their brand well enough to give you examples.

go to your local field and see what they fly, because if you are going to be instructed via a "buddy box" you are going to want to use compatable radios (futaba/futaba futaba/hitech jr/jr a jr radio wont work with a futaba)

personaly I would recomend the futaba 9C if you can afford it, or the 6X. But then again, like I said, I am biased