I've had great success with 4 or 5 in casual games. Lack of repositioning keeps me from trying them in a tournament but I haven't lost a casual game yet.
I run either 4 black sun aces with crackshot and 2 glitterstim or 5 cartel marauders. A variation I like is 4 marauders with an ion Scyk for 99 points. They have a lot of firepower and are beefy enough to last surprisingly long.
I tried 3 crackshot aces with VI tractor beam Serissu and the list is deadly. Tractored Vader back into 2 arcs that he dodged for three range 1 shots from the aces = dead Vader.