Recommendations — need single login forum, membership, download, ticketing

Hi,

I’m fairly new to wordpress working on a support site for a software startup, the functionality I would like to have:

– Forum – like bbpress, for community of users, as well as support for freemium offerings

– Ticketing – like WATS, for paid users of software to submit tickets, and check status

– Download Manager – like CM download manager, for paid users of software to download updates and patches (don’t necessarily need a plugin for this)

– Login/Membership – for registered users and paid users to log in, and have appropriate access to areas described above. (payment part not important here, purchases will most likely not be made online)

I’d like all of this functionality to be accessible from a single login for the site. It’s not clear to me which plugins use the wordpress built in users table, or use their own. Any advice on selecting plugins that would play nice together under a single login is appreciated.

Thank you.