My shooting partner and I have this scope:
Vortex Optics - Vortex Skyline 20-60x80 (Angled) Spotting Scope
We have been MORE than happy with it's performance and reliability over the last 18 months.
I took it to a shooting clinic last year and we compared it with Kowa's, Nikons, Bushnells, and several others. We could not see any significant difference at ranges out to approx. 800 yards, and interestingly, my sons, both who have better eyes than I, kept coming back to the Vortex over the more expensive Kowas and Nikons. Both said they liked the Vortex better.
It does not have the best eye relief in class, however, so if you need more eye relief, there may be better options.
It also comes in an ED version for approx. $300 more, but we have been very happy with the non-ED version.