I am surprised the Pentax 65 ED hasn't been mentioned at all yet. Depending on what eyepiece you use with it the optical performance has been compared to the much more expensive European brands. Eye relief can be very good as well depending on, again, which eyepiece you choose to use with it. A link to a an extensive review of it is below...

http://www.betterviewdesired.com/Pentax-65-mm-Spotting-Scope.php

I am not sure if size matters but if it doesn't then I would suggest the Theron Optics Mag82. It is a bigger and heavier scope than any of the 60 mm class models that have been discussed so far but it comes with both a fixed power - 30x -wide angle zoom and a 25-75x zoom. Eye relief with the 30xbis very good while the zoom is a bit on the short side. Optical performance is excellent in all practical areas.

If you are stuck on Leupold then I would suggest the Kenai. Same size and eyepiece combo (zoom and wide angle 30x) as the Theron and about the same price.

Frank