Your best units are Kao x10 Goku, and SSJ Broly(PUR). I would say its a tie for 3rd place in your Core between Green Vegeta and Godku with vegeta having the edge due to his amazing defensive capabilities.
So if i were you, i would have Kao-Ku, SSJ Broly, and Vegeta(GRN) as your core and build your bench around them. That will give you a pretty solid Saiyan Team.
*EX Raditz, SP Bardock(GRN), and SJ Goku(Red) would make a solid bench.