I just bought a Leupold that I am going to put on my rifle that has a Nikon 6.5-20X44. It is a Monarch UCC
(see link) with an adjustable objective and target turret adjustments. It has been mounted for a couple years in the current rings and it may or may not have ring marks. I used it for a while to shoot 1000 yards (6.5x284 21.8 pound rifle so no recoil problems) and it does great. It would work great for someone on a budget who wants to shoot longrange target or for someone looking to upgrade their current hunting scope.
They are going for around $450 so I am listing mine for $425.