For starters, get Cross Cut (it goes with lots of combos), Crescent Moon (it's an awesomely powerful ranged attack), Kick (goes well with various combos), Deadly Blow (critical hits!!), and I can't seem to live without Mana Recovery.
So yeah, that's basically the skills that I focus on. I made the mistake of adding points to useless skills (Finishing Blow), so I'm not sure how that affects my build.
It's best to use a character as a "guinea pig", of sorts, to figure out which works best. Then get started on a "serious" character to level and raise perfectly.