Membership upgrade text include plugin?

I was wondering if anyone could recommend a good wordpress plugin that would allow me to have a templated box of text/graphics/links/etc that I could put at the bottom on all public article pages, where I could basically say.. “not a member, here’s why you should join… click here to join” type message….

ideally, i could create one or more of these messages and auto-include them on certain pages/posts….

Any ideas on any existing plugins that do this type functionality?

Thanks in advance