I like the middle relievers approach - if in fact you're going that route, maybe someone like Broxton is available? He and Zumaya are two who might end up getting a shot to close later. I don't, however, think that the rest of your team is strong enough that you could afford to punt saves.
I don't really care for your outfield at all, though. If you believe in Alex Gordon, maybe you would consider trading Zimmerman for some help there - maybe a Matsui type? Or, if this is just a mock, you might considering drafting an outfielder with that pick instead of Zimmerman.