Navigation Menu Based On Member Lever

I am hoping to make my websites navigation menu change to different things once a member is signed in - Is this possible? If so, How? Do I need to buy a mod?

 Have you looked at- http://www.YOUR-SITE.com/m/pageac/admin/

Yes, if you have not installed the included Boonex module, Page Access Control, install it and you can then hide and show menu items based on membership level.

I noticed you have a job posted for this that says-

"I will also want to make it so there are different pages showing for different types of users"

This can easily be achieved with-

http://www.boonex.com/m/Profile_Types_Splitter_Basic
http://www.boonex.com/m/Profile_Types_Splitter_Premium

Either are pretty handy....and Anton also has a plugin for membership levels to be tied to the Profile Types which may be even more helpful for you.

BTW- Anton is the creator of Page Access Control as well