Regarding use of Vim and Eclipse, the Vrapper project has a good enough emulation of Vi in Eclipse, enough so that I've been able to use it without hitting many limitations in my daily use.
I'm currently using Vrapper, and it's been a year or two since I tried Eclim. But as I recall, it's a question of which is primary.
With Eclim you get all of vim, as you say, but you lose a bit of the native eclipse editor functionality.
With Vrapper you get all of eclipse, and a subset of the core vim commands. It's not vim, but you get to keep all of the features of the native eclipse editor.
http://vrapper.sourceforge.net/home/