Polks actually offers the best value in this space. They have 6 and 8 channel radios that offer fully synthesized transmitters and receivers (meaning they can use any channel), 100 model memory, a frequency scanner in the transmitter that confirms the channel is not in use and does not send out any signal if it is, and a bunch of other features. All this, and more, and they are in the $200 range. For more information, go to: http://www.polkshobby.com

Edit: no, I don't work at Polks and I have no financial ties to them.