Its not the glass that you need its the dialling and the holding zero .
The VX3i and in my limited experience the VX5 have quite soft clicks so youd need a zero lock more than a stop as they move a few clucks rubbing on bushes hand pack and stuff. Check the feel before you buy. If looking at the swaro Z5 have a feel whether the turrets are solid or do they wobble under finger pressure ?
My opinion is you have the right idea using a plain duplex for dialling, not any holdover reticle unless you are FFP.
At $800 even second hand you will be getting something the previous owner found not quite ideal.
A few years back there was a scope called superslam i think which was a bit budget ( smaller field of view than some) but did the job and people might be looking to upgrade now.
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