That depends on what your starting pitching staff looks like right now. If you're hurting for an ace and have a solid offense, then I say go for it. If your staff is solid and you have a sub-par collection of hitters though, I'd hold off--as a Giants fan I watch Posey every day and can honestly tell you that his kid is the real deal.
Tomassius Active Batters MLB Napoli, Mike C ANA Posey, Buster C SF Teixeira, Mark 1B NYY McGehee, Casey 3B MIL Jones, Chipper 3B ATL Reyes, Jose SS NYM Johnson, Kelly 2B ARI Votto, Joey 1B CIN Boesch, Brennan RF DET Bruce, Jay RF CIN Granderson, Curtis CF NYY Markakis, Nick RF BAL Quentin, Carlos LF CHW Tabata, Jose LF PIT
Active Pitchers MLB Baker, Scott SP MIN De La Rosa, Jorge SP COL Feliz, Neftali RP TEX Haren, Dan SP ARI Kershaw, Clayton SP LA Marmol, Carlos RP CHC Matusz, Brian SP BAL Nunez, Leo RP FLA Slowey, Kevin SP MIN
I agree with the group. Pitching gets a nice boost. I love posey but your staff improves getting a ace who can dominate. That said posey killed it last week do I see the hesitation.
At first I would have said to stand pat, but I do see the point of the other repliers saying to take the deal... It would be a "classic" sell-high on your part... If it was a keeper league, I would say stand pat, but since it is NOT, take the deal!