I wouldn’t use anything but Gantry.

I wouldn’t use anything but Gantry. I’ve been using Gantry on WordPress and Joomla for around 10 years. It simply works well and RocketTheme.com regularly updates the project. It’s a little daunting at first, but it’s well worth it once you get it. It is very good switching between Mobile and Desktop Versions. The menus work well on both size screens. That is just one great thing about Gantry. You won’t be disappointed and you can always upgrade to one of their themes that use Gantry and save yourself a ton of styling work.

Gantry, being free from Gantry.Org, that is the place to get it with their free themes if you know nothing about Gantry. Even their Free Themes are great. NEVER download any themes/templates from 3rd party sites unless you want Adware or worse injected into the code.

Good luck with your website, especially if you don’t use gantry.