I just logged on to ask the exact same question.
I have my choices nailed down to 3 scopes.
The 2.25x16 Bushnell Elite 6500 with DOA reticle
The Zeiss 4.5x14 Conquest with Rapid Z 800(or 1000)
Leupold VX3 4.5x14 with CDS.
I am leaning towards the Zeiss.....
I am pretty sure the CDS system works much like the Custom GreyBull Precision Leupold optic seen here...
YouTube - GreyBull Precision Long Range Hunting