I'd say Bushnell would be as low as I'd go, personally. But I may occasionally engage MOA targets at > 1,000 yards. Hopefully soon.
Leica are decent but don't range as well as they're rated. At least not easily. Swarovski does really good. I've heard Zeiss does as well. Bushnell optics aren't as pretty, but they work. Talked to Vortex at their booth at SHOT and as far as I can remember they don't have anything that'll range 1,000 yards vs a non-reflective target.
Can't tell you anything about Leupold. I've been to their booth at 3 SHOT shows, and to date nobody has been willing to show me their line. I've given up, though my MK IV spotting scope is quite nice.