Interestingly enough, I actually used a variation on the DMGII business rules to arrive at my own starting soul total. ^^; Basically, rather than having minions who go out and collect souls for her like everyone else, she engages in a lucrative yet risky business that I'm tentatively terming 'Hero Hunting'.  She goes out, defeats powerful and famous heroes, traps their souls in her soul gems, and then sells them off to powerful fiends and evil gods for a tidy profit.<br/><br/>I think it serves as a good proof of concept.  Just tack an extra zero onto the final profit calculations, figure out what sort of modifiers the assorted minions would give...  And it would be ready to go.