I try and stick to a certian glass qaulity that seems to be ideal for my eye's. I don't worry to much about what they are sitting on. having said that my budget is usually in the 600-700 dollar range for scopes and maybe one and a half to two times that for the rifle. I prefer Trijicon's, Swaro's (1in). and some Leupy's or Vortex tossed in for good measure.