I personally like Maguma Studio too. It's feature packed, has built in function insight, and it's stable and lightweight.
I've used PHPEdit, but it's not stable, and is lacking in features. Don't get me wrong, PHPEdit is nice, but it has a long way to go.
I've also tried PHPEd by NuSphere, it's nice, but commercial and expensive ($299). The installer isn't very user friendly and it does not have [very good] function insight.
Macromedia Homesite is pretty much a HTML editor, and has no PHP features besides syntax highlighting out of the box. This page has some 3rd party PHP add-on's for Homesite.
If you're looking for a basic text editor with syntax highlighting, look in to VIM. Very robust, and kicks the crap out of emacs (I couldn't resist).
If you're still want more choices, check out The PHP Editor List.
Cheers,
a9