> Much as I like Sublime Text, the fact that it's proprietary has prevented me from using it.
Same here, and when I recently ran into some built in limitations with gvim regarding its inability to easily deal with proportional width fonts, I switched to Atom. I've been really happy so far -- the vim mode plugin is nice. Atom isn't perfect, but it's good enough for now, and the extensibility model makes me confident that it will just keep getting better.