There are not that many choices. There is a CH 6 lever Quadrant and a Saitek
3 lever Quadrant. There is also someone who offers custom made engine controls http://SimHQ.com/forum/ubbthreads.php/topics/4140505/1
I have owned the Saitek
and the CH Quadrants. Quality wise the CH is worlds ahead. Only the short travel of the levers are a downside in my opinion. The Saitek
have a long travel,which is good. But the quality of the potentiometers it uses is really bad. They start to spike after a while,which is not good at all for throttle,mixture and radiator controls. Now I'm using a custom made Throttle Quadrant by spitsim.co.uk and couldn't be happier. It was expensive and some do it yourself on my part was necessary. But worth it in the end.