Ask YC: Recommend a white label comment system?

My company has been looking for a good commenting system for general use across multiple parts of our site. We have been using Groupee for our forums for several years but until recently they have not offered a commenting system, though one is in development. It hasn't been released yet, so we want to explore alternatives along with theirs. We have been trying out Jive for a new forum alternative since the beginning of the year, and while overall the forum system is excellent, its comment widget functionality is lacking. We have spent dozens of man hours trying to customize it to work with our existing member registration system but its been like putting lipstick on a pig. I have talked to the founders of Disqus and their system can't integrate with our system to the degree we need. I've looked at Intensedebate.com tonight and while I am impressed with some of the functionality, they are way too beta for my bosses to be comfortable with. I saw huge bugs with their system within 10 minutes of trying it out. Are there any alternative commenting systems? We are more than prepared to host internally (we're already setup for Jive) or to use a third party system if it has good integration options? For integration points: 1) Needs to integrate with our registration/user system. 2) Allow us to use our member profile images for avatars. 3) Advanced options that are wanted but not mandatory: Threaded comments, pagination, basic WYSIWYG text editing. Thanks HN!