Hi all,
I am using Zend Studio for Eclipse, wich is PDT with vitamines, many more features (to do EVERYTHING inside the IDE, from PHP,HTML and CSS Editors to DATABASE Browser, passing from Source Version Control, Tracking, and Web Browser), about the autocomplete, is good (just good), the lag (wich exists), is really very few in my opinion...
My opinion... give it a try... i think that Zend Studio is a good choice.
Just my two cents...
PD: Sorry for my amateur english :P