Im also a Dolphins fan, been a fan of their my whole life, which was back in the Griese, Csonka, Warfield, etc days.
Personally I would stay the course with the Dolphins, but Im bias and I hate the Raiders,lol. Dolphins would be the closest of those teams as far as being a playoff team, but still have a lot of needs to make them real good.
Browns would be my choice for you if you just dont want to use Miami. Browns have some talent, and there would definitely be a satisfaction factor if you could build a constant winner in the Browns.
Raiders are just a embarrasment to football like the Cubs are to baseball, and have all kinds of issues and lack talent. Carr I do believe can be a good QB, hopefully he dont get caught in the Raiders trapp and have his career ruined. If he had went to a halfway descent team I think he could be a franchise type QB.
Wouldnt have minded if the Dolphins could have got him and did away with Tannehil. Tannehil is just to inconsistent, if he ever gets his head out of his rear and keep it out of his rear I do think he can be a sold QB. Now days with all the stupid rule changes playing QB isnt nearly as difficult as it use to be, so hopefully Tannehil gets it going. Back in Marino's days not sure Tannehill could have even been a backup, but you could say that for a few starting QB's in the league today. Even some of the good ones wouldnt be nearly as good if they had played back in those days,lol.