Never heard of anyone getting pulled for a visor. If they know their stuff they might "do" you if you've been riding like a tosser but highly un-likely.

Got mine from racevisors.co.uk. Get the darkest one arai do then, like you said, carry both. Don't see the point in a slight tint.

Also handy off the bike too!
http://i999.photobucket.com/albums/a...une2008045.jpg