I'd like to see Ellen Muth, for those that don't know her she was on an American TV series Dead Like Me, and she's a member of Mensa - she's got something interesting about her which makes me think she'd be a good, non-typical HM and she's not super famous so probably affordable
I agree Courtney Love would be great.
Charlotte Church just popped into my head, I think she could be a good HM and wouldn't shy away from conflict, and she's done very little in recent years so could probably do with the boost