AP have released a new mount to replace the AP900. The AP1100GTO with accurate encoders as an option (the option is not available until next year though).
http://www.astromart.com/classifieds...fied_id=830017
And the AP website here:
http://www.astro-physics.com/
I think this may be a hot mount. See the AP website for examples of 10 minute unguided images with perfect round pinpoint stars.
I wonder if SB will offer encoders as an option for PMX/PME.
It seems the way the mount industry is going that these will become more common and preferable to the ancient technique/black art known as autoguiding!
Greg.