My bad if this ground has already been covered.... but would Harden be a good move for the Pirates? his contract is going to be hard to predict, given his injury issues, but say for a two-year contract? The Pirates have enough spare payroll lying around that they could afford the risk, say 7 mil for two years, with some incentives?
On a simlar note, how about Ben Sheets? He'd probably be worthless until midseason or later, but who is better positioned right now than the Pirates, to take a risk like that? Risk: waste some money, and burn a roster spot while he shows he's toast. Upside: Get an ace for cheap.