ok, I finally changed to a them that is up to the current wordpress-widget-stuff :)
I'm also giving disqus a new try. Version 2.0 of the plugin automatically syncs with the wordpress database, so plugins aren't "disqus only";. Now I've just gotta figure out if they support something like "notify by email"; for answers…
The old comments should be imported to disqus within the next few hours.
Auto-sync for new comments between wordpress and disqus seems to be working fine!
Just commented on this post using the disqus featue and it's also in the Wordpress database.
Importing comments from Wordpress to Disqus started:
Wow, awesome support!
Update 5: some emails and an updated plugin later: