Acually, I can't see why the WG would even bother putting a bounty of ANY of the Strawhats after EL. Why? They have BC after then, they are dead. I doubt the Strawhats will take care of the whole BC now, that's very unlikely (but I still think Usopp will attack and crush a couple of ships, so all of them can escape). The WG will instead hold what they did in mind, and put ALOT higher bounties on them when they have crushed the whole BC (which they probably will), and have done maybe something more. Like beating the shit out of Doflammingo or Jinbei, or some strong marine officers/vice-admirals/admirals/whatever.
Because, there is no logic to put a bounty on a already dead crew. ;)
When they will get their bounties, I think it will be something like this:
Luffy - 300-350 - For beeing the leader and all, taking care of alot of soldiers and taking down the strongest CP9, and maybe destroying some BC ships or/and vice-admirals, and/or maybe Jinbei and Doflammingo and some more guys.
Zoro - 200-250 - For beeing pure badass, and acting as a right hand to Luffy, doing EXACTLY whatever he tell him to do. For beating the shit out of a strong CP9, being the indirect leader of the attack against EL and maybe taking down some BC ships/vice-admirals, and perhaps some more men, at Doflammingo or Jinbei arc.
Sanji - 120 - Just because he said that his bounty would be the twice Zoro's first. I would like that idea to take a new form so that Sanji will get his first, then Zoro gets one that is the double of Sanji's first. ^^ He get his for the train action, taking care of a CP9 and destroying some WG deep down plans (in the future perhaps? Sanji is the Strawhats James Bond after all).
Usopp/SogeKing - 30-60-90 - The double of Luffys first would creat a great symbolic sign, 30 would also work, but seems a bit low, 'cause the WG probably know what he can do, with both his weapons and brain. The triple Luffy's first would also work. XD Destroying the flag infront of one hell a lot of soldiers, converting the giants to their side and acting a vital sniper against the BC attack (taking care of some ships probably). The WG would see him as one of the top ranked SHs.
Franky - 120 - I think we will see some "action" between Franky and Sanji from now on, maybe 'cause I want Zoro to move up to Luffys league more than Sanji's. And Franky and Sanji already had their little fights. :P He get his bounty for burning the Pluton blueprints (if he could do something that bad, he could perhaps do something even more awful, the WG may think). He also did beat a CP9, and will act a one great soldier in the upcoming arcs against whatever Oda will put them against, and the WG will know of it. Maybe they will even think he got the plans for Pluton still, making him one of the absolute top dangers of the Strawhats. If that is the case, a higher bounty on his head would be put, like, something about Zoro's amount. But I doubt it.
Chopper - 90-150 - I do not think they would give him a bounty for EL, for taking down a CP9, sure, but I doubt they knew he was the monster who crushed half of the house they are fighting in. XD I think Chopper will have his own little "story arc" in one of the upcoming ones. Like maybe when they meet Jinbei, he will make Chopper question why he is with the SH, when he is the only one that is not human among them. And humans are less worth (Jinbei's though? He was the captain of Arlong.) In that arc, Chopper will do something very badass that will put him on the WG's wantedlist. Destroying a big marine base by taking the third rumble ball? Maybe even fight Jinbei? :O (we do not know how strong or how high Jinbei's bounty (former) is.
Robins I am a bit worried about. They probably will raise her bounty when they discover what the SH will do to save her, but she could do something bad as well. About 150 I think she will get in some future. With Nami I'm unsure. Something about Usopp's amount. She will also do something big, like Chopper will, in some future arc.
That's at least my thoughts.