i wouldn't say that the 552 or 512 are the 'gold standard' as i have both and the EXPS models are far better in my book although they are all great and i'm an EO fan, not fan boy.
i have an EO, T1, S&B Short Dots, Weaver superslam 1.1-4 all FFP's and most are dedicated to a certain rifle although they are switchable with minimal POA/POI shift.
I had a Strike Fire bright dot that i liked well enough, but it got sold with the rifle i was selling. i would not discount it as a great scope for the 15-22, cheap enough, just get the 'Bright' not the red/green as they wash out in the sun where the 'Bright' does not.
i'm not an ACOG or Leupold fan, just because. anyway the stuff from PA is good, but i would not go any cheaper. just my .03 cents!