I notice the Leica Zoom 25x-50x ASPH (17.8-8.9mm) hasn't been mentioned. It performs much like a Delos/XW zoom in terms of the FOV and image quality; eye relief is long but 2 or 3mm shy of the Delos. Not everyone's cup of tea but I enjoy the convenience of not changing eyepieces.
My viewing conditions don't allow me to push gear to it's limits but more than one person has compared the Leica favourably with premium planetary eyepieces.
http://www.cloudynights.com/page/art...178-89mm-r2317