As far as I know, Hhampuz is well known and recognized for valuable signature campaigns. bubbalex is kind of new to campaign managing but he's capable, supportive and strict on his evaluation. Arteezy.rtx is an old manager, however I don't like his stake diversifications on Facebook and Twitter campaigns (only two levels: <500 friends/followers and > 500). I don't know much about the rest of your list.

By the way, I'd like to name some other qualified managers (according to me): Parodium & julerz12 (for normal bounties), yahoo62278 (mostly sig campaigns).