I've always said that Annie would be a great mentor. The chances of her doing X Factor are zero though. We do need a Scot on the panel so as ever I suggest KT Tunstall. She's smart, credible, hilarious and down to Earth. Not sure if she has a high opinion of reality TV though.
They have to keep Louis but make him "head judge". I agree with the poster who said a younger male would be a welcome addition to the panel. Will Young I guess would be a good signing but maybe one of the McFly guys wold work.
Bonnie Tyler would be a fun judge too, she's nice but a bit nuts too.