All of you will probably think I'm nukkin futz but I use a Celestron 100 ED for my spotter on a Manfroto CF tripod. The Celestron has a 100mm Objective, Magnesium body and it accepts standard astronomical eye pieces so the sky is the limit on what you can get. Mine shipped with a 60X zoom eye piece. I put it up next to my buddy's Swaro on my front porch and dialed in on a barn 1.5 miles away. Barring thermal distortion (was mid day sumnmer), neither of us could discern and quality difference between the two. Using the fine focus adjustment on the Celestron, I was able to see a knothole in the side of the barn clearly at 1.5 miles.
I use mine for star gazing and birding too. It's a helluva spotter and best of all, it's under 700 bucks. Got the tripod and spotter for just under a grand.
I like the big objective for it's light gathering capability. Comes with a built in sunshade and carrying ballistic nylon case.
Having said that, I about went bust on the Swaro EL Range bino's I didn't want an angry wife over the spotter, the EL's were bad enough.
It's not light but you can really reach out and see a loooooong way.