ring shopping is more confusing than scope shopping. low, med, high?? rifle is a stevens 200 model in .308 cal. no bases currently attached to gun. scope will be one of these: Nikon ProStaff, Nikon Buckmaster, Burris FullField II or Bushnell Elite 3200 (all in 3-9x40). looking for recommendations for bases and rings please. anybody have any love or hatred for specific brands or types? thanks