I'm bored with my coax heli, especially the cheap transmitter sucks, so I'm looking for a micro heli which is compatible with the Hitec Aurora 9, something around the level of the HK-190 would be nice.
The smallest blade heli with a separate receiver is the sr I believe. Too big I'm guessing. Most micros either have a spektrum Rx or a proprietary 2.4 system.