Hans,
Anacortes have produced a comparison chart (open the image)
http://www.astromart.com/classifieds...fied_id=686672 Pity iOptron didn't openly give these details on their own website.
The EQ6 or Vixen SXW were undersized for my scopes but the iEQ45 is tempting I must admit, though I think I'll stick with altaz.