Hi Wink and all,
Frankly I love the smell of a Diesel locomotive but not before breakfast. On a serious note, a forum is not an on line catalog, here you'll get opinions, there you'll get useful information. Your question would better be rephrased as "What brands of rotors are there?" and browse for one that best suits your purpose. There you'll find the specs you need, torque, wind load survivability, mounting options and of course a control box with features you'll find useful. For my own purposes remembering the heading is sufficient.
Then you can skip the question entirely and go to the ham radio stores' web sites, HRO, Cheapham (a couple of friends, plug) Fair Radio, Burkhart and others abound with really neat stuff. Check out the ham forums and web sites too, click on the ads/links and you're there. Any web search engine will take you where you want to go, there's lots out there.
One point worth remembering, one with a brake is preferable. If your antenna is of substantial weight and/or has significant wind loading characteristics you don't want it to jig around in the wind and damage the ring and pinion gears, replacement can be expensive.
