So, I've used Emacs as long as I've used Unix, and it's generally treated me well. But sometimes I wonder if there's something out there that might be better for me. Remembering that I spend a lot of time in a text editor, is there something else I should be looking at?

Some features I require:

• Open source (and usable on Linux and FreeBSD of course).
• Python scriptable (that's kind of the point of switching; preferable if it's 100% Python).
• Good handling of multiple files and windows; I like using Emacs with a single editor instance, and sending requests to that instance to open files and whatnot. If the editor can't do this, it's probably architecturally limited in such a way that I'll never be happy with it.

Some features I want but maybe don't need:

• All the standard stuff, source highlighting, supports a variety of languages, incremental search, etc.
• Good indenting support. Does any editor do the kind of smart indenting that Emacs does? This isn't strictly required, but I bet I'll be unhappy without it.
• Emacs keybindings.
• Remote editing over ssh.
• Windows and Mac support.

And of course:

• Actively developed.

I actually kind of doubt I'll drop Emacs, since I usually realize that Emacs has features I didn't even realize I'm constantly using. But I thought I'd give it a try. I'm not sure I'm up for Eclipse, though, and if Emacs is showing its age then Vim is just showing a different sort of age.

Maybe to be helpful, these are things I don't care about:

• The toolkit -- GTK, Qt, Tk, wx, whatever.
• IDE features (they don't necessarily hurt, but realistically I never use those features).
• The visual appearance.
• "User friendliness" in any traditional sense; I'm a serious user, and traditional UI guidelines typically don't apply. To give you some sense of my perspective, I consider Emacs to be one of the best user interfaces ever (given its target audience). I want the next Emacs.