Re: Need a 1-6 or more?
I use a 1-6x24 Swaro z6i on my 16" SR-25, and it works great out to 600 meters, it's really an outstanding optic. The 1-6 is plenty of power within the ranges you are describing.
The Leupold and the SWFA are not yet out, so it's really tough to compare them, although I did get to briefly check out the Leupold 1-6 and it is really nice as well. I'm not a big fan of the CMR-W reticle, because it uses a BDC instead of just being mil based, but the TMR version would work great.