Leupold has always had the reputation of being pretty consistant with their products. Consistantancy (sp) equals accuracy, and their products have stood up to the test of time.
The newer long range models are great scopes. Finally we have a varible power scope with MK IV capabilities: lots of adjustments for W and E, 30mm tube, an easier focus knob to aquire. They are good out to the 1000, plus you have the option to have the scope boosted in power if you choose. Premier Reticle does work on Leupolds, and they are well established.
The tactical line of scopes are pretty well constructed, but be sure to get one with an A/O. These will reach out to the longer ranges. I have one without the A/O, and I think it tops out around 800 yds. Unfortunately I have not yet found out, but at 1000 we were advised not to shoot if we did not have the A/O, since the dial would be topped out and make the shots more difficult.
Another vote goes towards the Tasco SS. I had one in 16x but never mounted it cause I ran out of rifles. It is now mounted on a friend's rifle, who has been satisfied with its performance.