However, long term I strongly suggest you take a look at marketing automation platforms – notably Marketo. (Disclaimer: we are a Marketo agency partner). Marketo integrates seamlessly with the leading Webinar platforms and gives you much greater flexibility in creative design, list segmentation, dynamic content, and the way you respond to and manage those who register to the event. They offer a small business solution, Spark, which includes Webinar platform integration, if their professional version seems out of line cost-wise with your plans.

Potential segments segment scenarios include business size, product categories, audience profiles, etc.