Although this is an ancient thread the info within might still be relevant so here's my take on the question at hand.

Nusphere PhpED. That is the last php IDE you will ever try, it is that good!
Like all good things in life this isn't free unfortunately. But it is fairly cheap.
When it comes to source control tortoise(svn) is your friend.

(I do all my dev on a windows machine so naturally I've only tried the windows version of PhpED.)