If you stick with vim or emacs, you may want to check out ctags (or etags), to help you with some of the functionality you normally get in an IDE. IMHO, when you go the non-IDE route, you will forgo some features you are used to and satisfy those needs with alternative mechanisms. This is my personal preference. It's a bit of a learning curve, but I think you end up with a much better understanding how your code fits together.