Well actually, I guess the first thing I'd want is to delete all outdated spells. Any spell that has an upgrade and can be deleted I'd want gone. If any events come up that required an old outdated spell - then I'd just go pick it up again.
Secondly I'd sort it by group buff, self buff, debuffs, nuke, dot, heal, heal over time, runes, utility... etc. One page per type or something like that.
I'll just do it manually for now. Oh what fun!