I'm thinking of using either the brushless E-Flite 370 or 400. I just started buying equipment for the Ultimate and so far I've dropped $90 on four of those new Hitec HS-56HB servos with the Karbonite gears. There was an article in Flying Models where the guy used them, so I figured what the hell. With this plane, I don't care how much it costs, and as long as it flies like a beast who cares?