Interworx 3.0 is finally out, and yes, I mean FINALLY... There is now absolutely no reason to not select Interworx as your control panel of choice since it now has full multi-domain support for each user, greatly improved reseller features, and some other things which you can read about here, as I don't have the time to go through all of them. We have been working with Interworx for well over a year now and we have had great experiences with the software and with the team behind the software. Now with this update, there is no reason we wouldn't recommend Interworx to anyone for any purpose. If you're not familiar with Interworx go to their site. Then when you change to Interworx you can get used to a fully featured control panel with a responsive and intuitive interface, one not full of bugs and which flexibly allows you to work inside of it, changing configurations manually and not breaking, etc.
We offer Interworx with all of our VPS accounts for the standard $5 a month fee and with all our dedicated servers in two flavors, 35 domain (Free) and unlimited domains ($10 a month). Interworx is also offered in clustered configurations for those situations where one server just isn't enough.