So there was Zend. Which I bought. By the time I got a strong enough machine which could run Zend Studio with anything I would call even remotely acceptable speed, I no longer needed the much caveated for tooltips.
There is Komodo. Nice. And expensive. And again, not native to my Kubuntu Linux, which makes it more sluggish than I like.
I stuck with KATE which, through the kio-slaves provided by KDE can access me any remote filesystem via any protocol I can dream of. It has a rudimentary autocomplete -- it's string based which is actually good when writing menu definitons and such.