I like DualSky motors for medium powered aircraft, I have been using quite a few and some have taken the abuse, they are pretty good. But as what Tom says, pay more and you will not have any headache. Look out for the Hyperion, they are quite great value for money and many have also been talking I used from Turnigy to DualSky, from AXI to Hyperion and Plettenberg. I love the Plettenberg. Alas, they are expensive.