If his bounty increases, these would be my estimates.
Luffy- 190-220 million beri
Zoro- 130-160 million beri
Robin- 130 million beri
Sanji- 110-130 million beri
Franky- 70-100 million beri
Sogeking/Chopper/Nami- 30-70 million beri
Pretty out there estimates but these are what I can guess. But I am unsure of some elements. Because consider the fact that if Franky joins the Straw Hats, then Luffy's crew will have two pieces of what could bring upon destruction. He has Robin and Franky in his crew. Franky could've have mesmerized the blueprints (or he could have not) and Robin can read the ancient text. This reason alone may have a direct effect on their bounties.
Also considering they just broke into Enies Lobby and basically slapped the Government in the face.