How about:
*Amanda Tapping > She canceled Collectormania, so why not bring her this time??
*Andrew-Lee Potts > Plays Connor Temple in Primeval, I'd love to meet him!!
*Benedict Cumberbatch > Plays Sherlock Holmes in BBC's Sherlock
*Keeley Hawes > If you're bringing Philip Glenister, Keeley should be there too ;D
*Some Torchwood/Doctor Who guests.