We use Goldcast as well. It just won't be the cheapest option.
It works well with SFDC. We map each webinar to a SFDC campaign and it updates real time. I don't have a seat, but can track in SFDC member status. I also like the video hubs. I link to these from in platform for upcoming live and on demand sessions.
The really nice thing about it, the URL converts to on-demand automatically. We used Splash before and this was a pain to do