It's funny that even though my New DW viewing has stalled at David Tennants first episode (not because I didn't like him, but because I misplaced the DVDs) and I've seen maybe two episodes of Old DW, I find myself having all these opinions about who should be the next Doctor :)

Of the most popular possibilities, I have to say that Paterson Joseph is my favourite as well. Although I think a female doctor would also be interesting - though I'd rather have it be a regular Doctor who just happened to regenerate as a woman rather than a gimmicky "bring back Billie Piper/Catherine Tate" Doctor.

Oh, and I think you got Jennifer Saunders and Joanna Lumley mixed up ;)