Bushnell 1600 or any of the Long Range units will work better than the 1000 yard units.
I use a Leica 1600 and have ranged rocks and trees at just under 2000 yards on good battery. I have ranged lots of deer and elk sized critters in the 1200-1500 range but it is a little sketchy. 800 is not issue at all for my leica, it is super fast and reliable.
Swarovski is another choice but they tend be a little expensive and I prefer the leica anyway.
I guess if you are going to go that route then look at the new Leica HB range finder and bino. Leica allows for user input of ballistic data for your set up. I have not used the new unit yet but if it is as good as the reviews I have read it could be pretty sweet.
My next purchase was going to be the G7 but at 1500.00 it was a bit of a stretch. My buddy is supposed to be getting the new Leica and I will have a chance to test it against my swaro el's and see how the solutions work out. It is nice to have options.