I think you should consider adding
Sylon manager to your list.
He manages a lot of campaigns, if you check his post history, you can see he everything works very up-to-date and answering all question to his participants.
Lol, seriously? He is probably one of the worst bounty managers on Bitcointalk. He even received negative trust because he accepts many spammers into his campaigns. Do you really think that Sylon deserves to be among best signature campaign managers?