I fly both an Aeroworks 50cc Yak and Extra. Both are great 3D/IMAC planes. I tend to like the Yak more since it's a little larger airframe which helps to slow it in downlines.

I agree with juanes1969 on digital servos, especially if you are going to fly IMAC. These hold center better and are programmable.

On the voltage regulator, use it on at least your receiver batteries. When fully charged, those will get to over 7 volts and a friend of mine burned out a PCM receiver because of this. I now use regulators on everything!