I am of the same position, I have trouble identifying where I have hit even at 100 I would tend to lean more towards the spotting scope as I would want a good pair of binos, if not now, in the future for field use. But a decently clear spotting scope would achieve the objective at the range.
Also.. where you looking for them? what price range.. I really haven't done any research on who in Alb/Wod stocks these