You may also want to take a look at the DVT Eclipse IDE from AMIQ. DVT supports e, SystemVerilog, VHDL and provides much more functionality then syntax highlight. like auto-complete, hyperlinks, class and module browsing, design hierarchies, diagrams, code refactoring, and more. There are guys happily working with it on mac.
For academic purposes you can get a free license, just fill in a form.
Just download a distribution for MAC from here:
http://www.dvteclipse.com/install_distribution.html