burris, nikon, pentax, supersniper, or the tried and true Bushnell 3200 or 4200 series. I like a good Weaver as well...oh yeah, Millet just put out a fine target scope, and got a Navy contract with it no less.
The Mark 2 is way better than the Bushnell 4200 is...I have both.
The Mark 2 has better glass, better clicks, better repeatability, and the Mark 2's are tested on the same equipment as the Mark 4's...they pass the same tests (durability)