The common suggestions you're going to get are Seekins, Burris XTRs and such. Generally the cheaper the rings, the more fitting you'll want/need to do to the rings.
If you're going to use a Pic rail or mounts, the Burris XTR's are tough to beat for the price. Weaver has their tactical rings that are decent and offered in Weaver and Pictinny spec options. Vortex even has rings with quality a two ends of the spectrum. Thay have an inexpensive price point model and then their serious Mil-Spec rings for higher-end applications.