As a heavy user of Formsite, these would be the features I would prioritize:

- Logic branching (if question 1 answer is 'A', then hide question 2. etc) - Confirmation emails to the submitter - Widgets to insert design elements (static text, images, etc)

IMO, these are bare minimum for B2B business if you are interested in pursuing that.

Having said that, this is a great start.