CMS quick question about variable permissions
 

The intention is to have 2 levels of user permission - 3 if you include 'guests'

guests won't be able to access forum or articles.

lowest level will only be able to access a certain small number of articles and 1 sub-forum

full members will be able to access all except the forum for moderators.

How's the best way to set this up?

Have the articles in a certain category set to show to those who are logged in and set all other articles in categories requiring a higher permission level?

Any tips, or thoughts on this would be appreciated by this noob! :)