From my vantage point this is all theoretical as I don't know individual team's system depth. I'll also add that I've never considered this team to be a contender and would put all of my emphasis into next year and beyond.
So, eventhough Bronson is locked up for a couple more years and is inexpensive, would you deal him for two high pitching prospects who could become contributors immediately for the Reds. I would think the ideal trading partner would have solid organizational depth at pitching but lacks that "post-season" presence that Arroyo can offer. Not a team like the Yanks. Also, being inexpensive opens up an entire worls of clubs that wouldn't be able or want to afford a one year rental.
I was personally never high on Arroyo and while he's had some great games to date, I don't like what I've seen the last few outings and would expect him to fall to his career norms sooner rather than later.
The whole premise behind this would be a 2 (at least) for one with the guys coming to the Reds ready to pitch and pitch well in the majors, not high A guys. Anyone willing to make such a move? If so, who fits the mold?