Check out the variety of micro electrics offered by Century helicopters (IMHO they make the best because they make only helicopters - from micro electrics to nitro 30/50/60/90 and gassers.

www.centuryheli.com

They are available through a number of dealers in North America and in my experience have excellent parts support.

I have their fixed pitch Hummingbird V3 (using their standard 7 cell pack) and their Elite CP (using their larger 8 cell optional pack) - both fly very well with about 6 minute run times.

No micro flies as well as a 30 size nitro such as the Hawk Pro, but as micros go these fly very well and can really take a beating.