Check out the Burris Tac30 1-4. It is the best low power variable that I have used (compared to Vortex PST, Leupold VXR, Leupold VX3i,Leupold VX6).
It can be used with both eyes open like a red dot but then gives you 4x magnification for calling or ID that a RDS won't.
I've posted previously that I thought the VXR 1.25-4 would be a better choice, but after using both side by side, I can't tell a quality difference in resolution day or night, the Burris has a bigger tube by 4mm, the heavy circle reticle is fast, and it can be used at night without the illumination if you're using a light. The Burris also has some BDC drops in the reticle.
Plus it's around $200 cheaper than the other options.
The VX6 is better quality, but unless it's a duty rifle, not worth the extra $600-$800 in my case for a short range hunting gun.