Honestly,
I would pass on the SII. I'm very happy with the SIII I have but I think there is better options below it. If you can swing the SIII, you will get 30mm tube, more elevation, better built/matching turrets, superior glass and reticle choices. You also get full access to the custom shop for any modifications you choose.
The build is very different.
SIII
If you are comfortable with the AO I would look into Burris. The offer a nicer reticle, good glass and matching turrets.
Priced in between, I would look into Bushnell's Elite Tactical line.
If you don't mind the turrets not matching the reticle look at the 2.5-16x42. I own one and its a nice scope. 30 mm tube with gobs of elevation. Only downside are the moa turrets for the mil reticle. Glass is good and mag range is great. For matching turrets take a look into the 3-12x which has a variety of options
Also in the mid price range is Leupold's VXR line. The glass is clear, capped turrets and illumination.
Lastly, I would look into Weaver's offerings, which I've come across lately. Glass and turrets are also good.
I really do like Sightron... I just think there's a lot better competition below their SIII line, which they've done very well with and put them on the map.
Good luck with your search-
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