15+-18 as medium,
19-21 as maximum
for a 1 level opener. I would prefer to play a system that limits the 1 level opening though - this range is way to wide, IMO.
The trend to emasculate the formerly game forcing 2♣ opening in Standard systems is a bad idea IMO. That bid is already way too "busy".
Not to mention that most people's opening NT ladder is, well, pretty ricketty.
That's why I like Romex - four forcing opening bids, and 1 of a suit is limited to about 18 HCP.

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