Hey guys, need some help sorting between these power supplies:

Seasonic G-550 ($125)
Seasonic M12II 520W ($105)
Antec HCG-520M ($99) (Yes I know, but it's Seasonic rebadge)
Seasonic S12II 520W ($95)

So is the M12II same as S12II, just modular?
And then Antec's just rebadged M12II?

And is the order of bestness in the order I listed, or does one stand out?

Thanks guys,
Alza