server
well, I have played with OS X server for sometime but I'm no expert, I found that even using server instead of just their desktop OS I still end up and a command prompt to configure things, so my choice would be run the standard OS X it comes with apache installed, you can easy install anything needed for a MAMP server. I find I administer MySQL from phpmyadmin so no difference from server to desktop, the apache running on server is the same one that runs on desktop, install what ever PHP package you like (I run PHP5). From setting up OS X server and learning the command line a little I have now set up a few LAMP servers being as the command line is simular to Linux prompt..
thanks...
DD