I think Leake is a good pitcher, but I think it may be a good time to trade him while he is at his peak value. I remember last spring training there were reports scouts from other teams were "raving" about him. After the solid season he had in 2013 you would have to figure the reds could get a very nice return for him from a team desperate for starting pitching.
A good fit might be up north in Cleveland, they could definitely use rotation depth. Or maybe the Chicago White Sox.
How about this idea:
Avisail Garcia for Mike Leake. Cheap, left field option with good hitting potential and years of control.