I wondered the same thing coming back.. fresh start on a new char maybe.. but consider all the progress already attained on your present char and ask yourself if you want to redo all of that? That's what made me stop and think about it. I have actually chosen a different class this time, but on the same char. This game is great for that. So my lvl 32 archer class is on hold and my lvl 19 conjurer is the class I'm playing and enjoying. AND I got her up 3 levels today in a few short hours of sheer fun.

Guess I'm saying choose the class you want to play and play it on that char. Totally fresh experience. Unless you want to go through the whole beginning quest lines again of course.