For my Oly Ultramatch, I have a Leupold Vari-X III 6.5-20X.
I went through several ring and rail setups, trying to get the height and eye relief right. I finally settled on the Armalite scope mount. This mount is very industrial looking, rings and base all one unit. It has a good forward offset for proper eye relief, and it mounts the centerline of the scope such that it is at the same height as A2 iron sights. So, I can mount this scoped rifle like I do my A2 configured ones. The Armalite mounts can be purchased for 1" and 30mm scopes, and the price is a reasonable $80, not much more than quality rings, and less than rings plus rail.
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For another flattop, a 16" carbine, I recently purchased an IOR-Bucharesti M2 with the IOR mount and rings. This is a 30 mm tube, and will work with the Armalite 30mm mount, too. In fact, I may very well change over to the Armalite.
This little jewel of a scope is excellent! It is a fixed 4x, but with a lit reticle, range finding scale, and bullet drop compensator set for M855 (62 gr), but should work pretty well for 55 gr - 69 gr. Big easy to adjust knobs, and it just seems to be perfectly suited for "offroad use". About $350.