First off, several of the RPs you list are in fact SPs (Miller and Iwakuma) in real life. That makes them intriguing to get already.
But: in my opinion, you go get Cahill and ditch Jeter and/or Escobar (you don't need two backup shortstops), and see if you can find room for Shelby Miller if you feel you need more SP. Brian McCann: droppable or tradeable. You don't need two catchers. For RPs, I'd look into that Japanese guy on the Cubs (he'll get the job sooner than we all think) or Rondon (reluctantly, and only if he's the closer for the Tigers). In short: drop Jeter, Escobar, McCann, look into Cahill, Miller, Cubs-guy.
I also like Marcum, Chen, or Garcia, and if you want to snag-and-trade Lohse, I'm all for that too. Good luck.