Please tell me exactly which plugins to use for BuddyPress Multisite

You have updated some of your plugins since I started my project and now I am confused as to which plugins I need.
I have BuddyPress on my main website. I want to offer members two levels of membership - a free blog and a premium blog. I have read many negative comments about BBpress so I am thinking of having one main forum using Simplepress. Am I correct in thinking that the Prosites plugin will be the only plugin I need and I won't need the membership plugin or pay to blog plugin?