I just bought a bushnell red dot with a recticle like that. In fact you can flip it from 3MOA to 10MOA to Crosshairs to The 3MOA with the 20MOA Circle. You can also flick it from red to green if you want depending on the light you are shooting in.

I put it on my Ruger MarkIII Pistol...seems pretty nice...I think the Circle within a circle is more for like an assult weapon, butI like the looks of it. For accuracy purposes what is the MOA of the center dot? Bigger the dot the worse the groupings are going to be.