Rings: DNZ, Leupold, or Redfield rings. The DNZ's are very nice.
Scope: Leupold, I have owned many Nikons & Leupolds over the last 30 years. There is no comparison on warranty service, after having a Nikon that quit holding I sent it back to the factory & they would not correct the issue unless I sent them over $100. The scope was in perfect condition & had never been abused. Needless to say I will never own another Nikon. Leupold has always given me excellent service & even changed turrets out for me @ no charge.