One thing to consider is that the Etison package ($297 per month) includes Clickfunnels “Actionetics.” This is Clickfunnels CRM/email marketing tool that provides the ability to interact with leads from the dashboard. In this case, you would not need a 3rd party email provider (such as Mailchimp). So while Etison costs more, you actually wouldn’t need other 3rd party tools because they are included in the Etison pricing package.
It's no surprise Unbounce is near the top of this list -- they've actually written the book on creating high-converting landing pages. Although there are lots of amazing things about this landing page, the two that I absolutely love are: 1) The use of a chat window instead of a classic form, and 2) the detailed -- but well packaged -- information below the form.
Whimsical isn't usually the first word that comes to mind when you think of HR software, but Teambit's illustration-heavy landing page is exactly that. A simple, one-field form is accompanied by a delightful office full of animal characters -- all of whom are very pleased with Teambit, in case you were wondering. An animal cartoon appears beside each informational section of the landing page, keeping visitors scrolling down to learn more.