Perona, out of those is the only one i can stand (and maybe Wiper but he just doesn't fit).

I think Jinbei will join eventually. I would also love to see Aokiji join them later on, now that he's not part of the Marines anymore. I think they're going to need a few more powerful crew members soon if their goal is to take on Kaidou's crew next since it was mentioned that Kaidou has over 500 synthetic DF users in his crew. Even with their alliance with Law, the SH's are still massively outnumbered.

I still miss Vivi. :(

Jimbei would be godlike too.

jimbei has already agreed to join the crew so i am going to say somone from whitebeards crew someone like marco or jozu

Aokiji is overpowered >.>

He is, but maybe that's exactly what the SH's need to go up against Kaidou and his 500 DF users.  Maybe he won't join the crew permanently, but I can definitely see Aokiji giving them a hand, perhaps in a pivotal turning point moment.  

That seems unlikely given their loyalty to Whitebeard.  Marco is also now the captain and their crew is still recovering from the loss of WB.  So unless they decide to disband, I can't see Marco of Jozu leaving to join the SH's.  

Perona would be fun. Princess Shirahoshi is too powerful. Like, she could beat the Marines by herself. Bon Clay is just awesome, such a great character.

Personally, I want Tashigi. She's adorable.

Mr. 2 is a good option too.