After putting in quite a few hours on my monk, i'm looking to change up a bit. I've heard and read good and fun things about both classes, which would be a more enjoyable experience, between leveling and farming inferno, and hopefully some paragon levels.
Just pick the DH. Your monk gear is easily transferable. But I don't think it'll matter anyway. You'll probably play the new class for only a few hours before you decide to "change it up" again. I hear Ritalin is quite affordable these days.
I guess you're right, I always assumed PK meant PvP. I never took it so literally. -- PenguinKoala. *actually admitted a mistake, shocker!*
I've played all 5 classes. My personal play style makes me gravitate towards ranged characters. I had fun leveling both my wizard and my DH. Also, I've found that running all 5 classes means that my drops are much more useful because while my WD doesn't need that +200STR item my barbarian can use it.
If you like a lot of flashy effects going off, go with wizard. If you like to shoot things, go with DH.