Finding the perfect IDE

I'm in search of a good Javascript editor. Visual studio 2005 has a halfway usefull one. Visual Studio 2008 is much improved but misses a lot of code completion that should be easy to spot. I read in a forum that Netbeans has decent support. But after downloading and opening a javascript file I get nothing. not even syntax highlighting.
So I'm still on the hunt for the perfect editor. Not just syntax highlighting. Even a basic text editor like Notepadd++ can do that. I'm looking for something more evolved. that gets me results and the data I need. I'm currently looking into Aptana because the screenshots look like what i want. I'll try and integrate it into my workflow and report the results a little later.