The only concern I would have with Burris is warranty, I can't say what they offer now, but a couple of years back I had a warranty problem, and had to return it to the US to have Burris deal with it, this required import/export paperwork. Burris did service the scope no problem and I never had any issues with it again, but also sold it no long afterwards.
I have Nightforce and US Optics scopes on some of my rifles, both have outstanding clarity. Both offer 100% repeatability if you use the turrets for doing comeups for different ranges.
I have yet to have a problem with the Nightforce so no info on how they are for warranty.
I did have an issue with a US Optics scope, my friend dropped my drag bag and the scope tube got bent. USO fixed it and I had it back in under 1 month at NO charge. I was impressed at the service, I did not expect it to be fixed NC as I would have thought being dropped was abuse. I did tell them it was dropped before I sent it. They will now have a lifelong proponent and customer. Fortunately this all occurred while in the US so there was no paperwork to deal with, not sure of the ramifications if this had happened up here.
I have seen the IOR scopes and they seem very clear as well, no direct experience with them however.
As Rohann points out the Leupold MK4s are pretty decent optics as well.
KK