I must confess, I'm a little confused how this helps your rotation. You're talking your starters?
I thought both Gonzalez and Valverde are slated to be closers in 2010. Has something changed recently?
I like the Borbon side of the deal slightly better. I think Borbon helps you over Pierre in five categories versus Valverde over Gonzalez, you'll see a bump in saves, but beyond that, while Valverde will outrank Gonzalez, the bump in value doesn't see as great. It's tough to evaluate since I don't have the complete proper tools (tried using Baseball Monster, but that doesn't have all those stats).
Since this is H2H, I think you want the higher value in as many categories as possible. And I think Borbon over Pierre gives you that moreso than Valverde over Gonzalez.
Thanks for the help on mine.