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.
1+ you should at least check this one out!
It is not the best for backpacking, but it has a life time warrenty.
I'm pleased with mine, for the money its hard to beat!