If we take your list and assume that Rivers gets traded, not Brees, what team would/could it be?
It probably wouldn't be the fish or else it would already be done.
It is probably not a team in contention unless they are very desperate. Rivers will likely struggle for a while before clicking. I would imagine that if the Chargers traded him to a lower level team they would take a draft pick, but might look for a player from a contender, especially and AFC contender. I don't know the Chargers current list of needs.
The Bucs are deperate, but would Rivers get them any more than Simms? I doubt it.
The Jets have almost got to be coming to grips with a bad 05. I can see them going after Rivers only if they know Pennington is toast for good (so maybe, but doubtful).
The Ravens aren't contending but might be stupid enough to think they are. Maybe but doubtful.
To me, this leaves the Browns and the Cards. Either one fits. Maybe the Browns moreso.
Of course it could be Rivers for Flutie straight up.