Here's the way I think you should play the classes:
Male: Monk, Barb, and WD
Female: Wiz and DH
Those are the defaults according to Blizzard, based on the website and old teaser material...
Personally I found the female Wizard to be a bit juvenile, so ended up with a male. I tried out a male DH, but found him far to 'Twilight' for my liking (saying that, I didn't give him much opportunity - don't think he made it out of the inn!). So, apart from the Wizard, that's pretty much what I have gone for.
Oh, and just to keep it OT... /serves up some sushi & sake