Meh, Sally was okay but she's not the coolest character in the world, like people tend to make her out to be (I really don't get the obsession with her). I don't see her being able to really deal with Torchwood 😛
Wouldn't mind Martha being back, though. And of course John should join on.
Though throughout the entire season I just kept thinking "...and why isn't Rhys on the team?" Because really, by this point he should be...
But even though Mickey was set up to be annoying at first, he really changed and developed as a character, and by the time he left Doctor Who he had gotten a lot of confidence and really found himself and was much more independent and interesting to watch. I think it would be a whole new experience to watch him on Torchwood.