As far as I know, autimatic isn't going to give up on AWP, so no oSee, Junior, Cooper or kaze. And even if he would be going to give up on it, Cooper is a big no (overrated), kaze is good, but there are better options in the US (Junior and oSee).
cxzi, motm and Spongey are not good enough; freakazoid is retired; dexter isn't joining, because Renegades might actually be better than Gen.G, plus they look satisfied with koosta's leading.
If I was Gen.G, I would pick oBo and Sonic (oSee / Junior if autimatic wants to rifle). Those would be the ideal choices in my opinion. Maybe also floppy, but he seems close to signing with Cloud9, and the only organization to prevent him is Complexity Gaming.