Zaalbar, Canderous, and HK-47 are all cool. I just can't pick one, it's too hard. Zaalbar has the strength, Canderous has the smarts (military wise, that is), and HK-47... well, he's droid who's just fun to have around (especially when you're a dark sider).
No one messes with a Wookiee, Ex-Mandolorian, and assassin droid! I'd like to see you beat that!