Style Sets for Specific Users

[Justice]

Basically, I want to only give certain members access to the selectable style sets. I'm keeping the style sets selectable in the control panel, so that the $stylecell menu is still available on the 'Edit Options' page for everyone, but I only want the styles to take effect on the members I specify.

This can be assigned one of two ways...

1) Having the extra style sets only available for members of a specified User Group.

or

2) Adding an extra profile field (one that only admins could modify), and manually specify either a 1 or 0.

Then I was thinking about adding an "if - then" statement in global.php or functions.php (I'm not sure where it would go yet) that assures that only the certain members could access style sets other than the default. I don't want anyone else to be able to enter "styleid=#" in the URL bar and have it work.

Any hints, warnings, suggestions, or ideas??