Bill
This a stepper system, what mount do you want to use it with?
IMHO the best stepper system at presetn would have to be the Littlefoot Elegance model
http://elegance.photo.rajiva.de/
Comparission tabel here
http://astronomie.rajiva.de/astronomie/smstv.html
The servo option I use with my G-11 is a Sitech.
http://www.siderealtechnology.com/