The thought of trotting out Carp, Waino, Oswalt, and Garcia in the playoffs (if we get there) made me really happy. And we'd be able to do it again next year, assuming everyone is healthy. That's a pretty damn good front 4.
Another angle to look at it from, is that Pujols has been adamant that for him to stay in STL, he's going to need to see a committment from the Cardinals to win and to win NOW. Getting a guy like Oswalt would definitely help Pujols' concerns about the Cardinals taking a few years off and saving some cash.