I was looking at both the primary arms and the millet, now I will wait for the vortex. I have owned things from primary arms and millet and did not have any complaints, I just think the vortex scope is a better quality product.
Waiting to hear how you like the tactical model. I have been considering the Tactical 4.0 in .40 as a carry gun. I already use an eagle for USPSA so lots of training ammo and mags are covered.
http://www.mgmswitchview.com/switchview-model-compatibility
Here is a list of scopes and the size of power adjustment rings. Maybe there is one close enough to work.