I use a Flysky GT3-B. Great 3 channel 2.4GHz radio. Got it for $35 from Hobbypartz, though I think they went up to $40. I also bought a 3s 2200mah lipo so I didn't have to use AA's in it. It will display the voltage of the pack on the screen so I know when to charge it.
My only complaint is that there is a bit of lag at long distances, though that happens to my GT2 also.