Getting my first rifle and need a scope. Purchased a Mossberg MVP Predator w/ 20" barrel in 5.56. Never shot with a scope before so I have no clue if Plex is better than BDC or what. I'm looking at spending $150-$175 and can get either a Vortex Crossfire 2, a Nikon ProStaff. or Redfield Revenge in that price range . Not looking to spend more as I feel that either of these will fit my needs. Is one better than the others? Which recticle do most prefer? Other suggestions?