I'd dangle Cam. Fitz is low value right now because last week, and I think Romo is going to be a top 5 QB play coming out of the bye with healed ribs and dez and miles @ 100%, now is not the time to sell him.
Defenses will eventually figure out cam, and he's bound to hit the rookie wall at some point. His value is through the roof right now-deal him. i'd think about aiming for brandon marshall, he's got so much upside and a new QB is going to be throwing to him a ton as the first read, and his last couple games have been kinda bleh. he's also a PPR MONSTER. good luck.
I would definitely KEEP Cam, as he's going to throw, a lot. He's also going to vulture TDs. It won't be pretty, but it will be fantasy beautiful.
Here's who I'm going to go with: Trade Fitzpatrick. His value might be a little low right now, but the Bills simply aren't talented enough to keep this up all year. Teams will find a way to rattle these guys eventually, and I'd much rather count on the Panthers sucking and Romo's talented recievers than Fitz, his O-line, and his recievers.
Cam will get you the most value. Romo and Fitz are coming off poor performances so they might not get you what you want. You could try throwing Fitz out there first, see what you can get and then offer Cam instead if you can't get what you're looking for with Fitz.