Advice on CMS access control

I’ve set up my first wordpress site which I intend to use primarily as a CMS for a small choir. While there will be some public content, I expect the majority of the content (both pages and posts) will be restricted to choir members. I’m looking for an access control plugin that allows me to default all content to members only, but allows me to specify particular pages/posts as public. I’d also like the navigation elements (menus etc) to change to reflect user permissions. So far I’ve found the WP Access control plugin, but its default seems hardwired to open access. And I’ve found the role scoper plugin, but I can’t figure out how to use it.

What is the suggested/most common plugin that can do what I want?