I'd start with one of the
Eflite Blades, which one depends on your skill level. Their ready-to-fly package comes with a good 4 or 6 channel 2.4GHz Spektrum radio that can be used on several models. Stay away from the cheap 27 and 49MHz radios.
You probably have a better idea than most what it takes to fly a collective pitch heli. If you think you can handle that, go with the
CP pro. That's about as big as can be flown indoors, and it can handle gentle winds outside too. Also, understand that larger helis are easier to control.
If you don't think you can handle collective pitch, and want to stay indoors, get one of the
mCX helis. The twin rotor helis are stable enough just about anyone can fly them.