* Let’s notice that no current autoresponder service comes with the Geographical Targeted Opt-in Form solution. I came to wish this kind of service to avoid some countries (or entire continents) to subscribe to some of my lists. I was hoping that I could control (i.e. according to IP adress, geolocation or Internet Service Providers) who would enter my lists. Regrettably, this seems impossible to do so through the autoresponder services.
You can absolutely do that. If you want to upgrade to a paid plan to get some of the features you want, then you can switch at any time through the My Products option in your account or with the help of a GoDaddy Guide. Once you upgrade your site will have all the same customizations and work that you've already put in place, just with the added features. See Website Builder plans and pricing for more info.
More-advanced options found in some builders let you process credit card payments and add your own cart and checkout pages. The more-powerful site builders include product promotions, email marketing, and inventory and shipping tools. Some let you sell digital downloads, while others don't; see the table above to find out which do. Only a couple of these builders let you put ads on your site, though most of them allow some degree of custom HTML code insertion.
Some site builders, such as Squarespace, Strikingly, Virb, and uKit, restrict you to placing page objects in spots that won't make your site look garish, which can be an advantage if design isn't your forte. Other builders offer more freedom; if that's what you're looking for, check out Gator or Wix. Gator in particular strikes a good balance between design freedom and reponsive restrictions.
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