i dont know....actually....i like the idea of almost all the chars possible :P
do you know titancalc dont you?
http://www.titancalc.com/
experiment a little bit with it..you can come with a couple good ideas :P
i like slayer (warfare/hunting) although i didnt try it...i just feel it could work :P
and right now im working on a spellbinder (defense/spirit), i believe spirit is a mastery that can work with any kind of mastery, is pretty multitask, if you wanna call it that way. :P