I've done quite extensive research and testing of multiple plugins and work-arounds to get what I think should be something pretty straight-forward.
What I am looking for is a way to restrict a post or page to a specific user so that only that user and myself can access the content. Example of how this would be used:
1. Client proposals: I create a client proposal as a post. The client can then access, and potentially edit the post, or at least can read the post and make comments on it. Combined with the ability to upload files, this could be perfect for proposals. However, the client should only be able to access his/her proposal - no one elses. The client should also be able to see this post on his/her dashboard but this would be a secondary feature.
If someone has been able to do this with a plugin I am unaware of or has a hack for a plugin, please let me know.