campaign desgin thoughts

I am working desgining a campaign using the buffy rpg system. the game is going to start with the PCs as normal HS students, one of whom will turn out to be heir to the power of the "guardian of the light". I had an IM conversation with a friend of mine about the selection process and the perils of power level disparity. Any further advice/thoughts would also be appreciated

( the conversation )

cross posted to unisystem and the rpg.net forums