Scouts can be fairly awesome, but the skirmish ability is kind of arbitrary. I move ten feet towards you, then ten feet away from you, improving my damage both times! Although there are stranger things, I suppose, and the idea that started it was a good one. Also, Killer, I've always liked taking the few levels of wild plains outrider for any mounted build.
Incidentally, I prefer the Shugenja to the Wu Jen. I'm not really sure why. Perhaps it has to do with the implication that their magic actually draws on the elements, rather than using magic to control the elements, but that's just a guess and may well be wrong.