I'm very interested in the 7.62x51 version.
Must be Non-Restricted (18.5-19" barrel).
Preferably threaded for a muzzle brake (5/8"-24 tpi would allow the greatest variety of aftermarket muzzle brakes; or 14x1mm RH if the standard VZ-58 muzzle brakes work well with that calibre).
Peep sight at the rear of the receiver.
Scope rails (side mount for short eye relief scopes, and above the piston for red dots; willing to pay extra for both).
10-round magazines (AICS would be compatible with the Ruger Gunsite Scout, and bolt-action rifles with AICS DBM; can't be loaded from stripper clips, but that's an acceptable compromise).
Edit: It seems that M14 magazines aren't all made to the same specifications, which can result in feeding issues (this is the reason quoted by Ruger for using AICS mags in the Gunsite Scout Rifle).
Folding and fixed stock (willing to pay extra for both).
Edit: Slightly longer Length-of-Pull (LoP) on the folding stock (my nose touches the sling attachment on my CZ-858; not a problem with 7.62x39mm recoil, but likely an issue with 7.62x51). A rubber butt pad would increase LoP and help absorb the heavier recoil.
Same ergonomics as the VZ-58/CZ-858.
Standard VZ-58 pistol grip and forend (compatible with aftermarket upgrades).
.308 barrel (not .310). 2 MOA accuracy or better.
$1000-$1200 would be quite reasonable.
Edit: And please don't write "Tactical" on the receiver. "Sporter" sounds more innocuous

, hopefully making it less of a target for potential restrictions in the future.