The Sig scope doesn't have a built in rangefinder but syncs via Bluetooth to the BDX range finder/binos
I've used the Sig scope you listed and thought it was rather horrible, the drop compensation worked well when synced to the range finder but the scope itself left a lot to be desired.
The Burris eliminator is really the only option for a fully built in system, there are other scopes out there but cost considerably more than 3000NZD.
Most people shooting long range use a "standard " scope as there are some limitations to the Burris eliminator, it works fine as a hunting scope for quick longish range shooting but for a true long range hunting or target shooting I'd be looking else where.
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