I dunno. While I love Karen, and think she'd be a great judge, I much prefer her punditry and wouldn't want to lose that. The week she was off and someone else filled in for her showed how great she is in choreography corner; she makes it easy to understand and she isn't afraid to criticise (although I do think she is a bit too positive, 'very clever choreography', at times she still is willing to criticise it). I want Karen to stay where she is.
I also like Alesha on the panel as, like Claudia on Film 2010, she speaks as a viewer rather than getting into technicalities and terminology that goes completely over my head! To be honest, the only judge I'd dispense with is Bruno - I'd like Alesha and Craig to stay, and unless Len is replaced by someone with a similar background he can stay. Bruno, however, I find to be irritating beyond belief!