gvim, vim cover 4 of the major wants you listed above:
- resource (only reason emacs sucks)
- X platform features
the kicker I've usually found is when you are working on a machine w/o enough resources for emacs OR some foreign machine that only has vi (elvis). Then most of the editing attributes you found in vim, gvim are still there .. just degraded.
Plus vim has reference book and other docs for those who want to get it and an active developer community (scripts etc).
All hail *Bram Moolenaar*