The only way I want the Jets to trade up for a QB is if they have the opportunity to do it for Bortles or Carr. Even then I'm not keen on trading up. I'd much rather risk missing out on every QB in this draft and plugging holes around the offense than pinning our hopes and dreams on yet another early-round QB who has no one to throw to or protect him.
I saw on Twitter this morning that someone (I don't recall who) predicts we'll take Amaro in round 1. I admittedly don't know much about him, but TE or elite WR is where I want to go in the early rounds, so this sounds good to me.
All of that said, if McCarron or Manziel fall to 18, I wouldn't kick a puppy if the Jets grab him there.