I use TextMate for all my development. While TextMate technically not an IDE, it as syntax highlighting for all the languages I need and integration with SVN. For eZP highlighting I use the ezp bundle: http://ez.no/developer/contribs/3rd_party/textmate_bundle_for_ez_template_and_ini_files
The Zend IDE was pretty good until the dual Intel Mac. I think they still haven't released a compatible php debug extension. I've been using Komodo for about a year and it's very good, you step through your code, add breakpoints and even debug your JavaScript. Very cool.
I'm actually using Komodo in combination with MAMP (Mac, Apache, Mysql, Php) it's a lot faster (x5-10) than the native php that comes with the Mac and all the config files are in one folder which makes changes and updates very easy.