I would go Harper and Fielder.
Hamilton has too many red flags
Posey is great, but catchers take a beating and are rarely consistent. I am a Giant's fan, and while I expect him to play well, I don't think there is any way he repeats those numbers from last year.
As others have pointed out, though, if you are in a 2-catcher league, it might be worth the risk to take Posey over Fielder.
By the way, does Medlen count as a RP in your league? If so, I would take him over Papelbon in a heartbeat.
help with mine?http://www.fantasybaseballcafe.com/forums/viewtopic.php?t=454769