I had to add my comment to all of this.  I have been searching hard for a David Tennant (10th Doctor) sim that came close to him and I really have to say yours is one of the best.  I would like to ask you though do you think you could try your hand at Jack Harkness (John Barrowman) and Rose Tyler (Billie Piper)?  I would appreciate it if you did, if you could as I have been looking around for them as sims as well and no one has come close yet.