As our good friend Peter Brand said, you shouldn't be worried about buying players. You should worry about buying wins. In reality, you are really buying runs that turn into wins.
A lot of teams will make the big mistake of going after the big name. The Marlins definitely seem to be going down that road. It will make them the darlings of November and December.
So, the Astros aren't looking to make waves. They are looking for incremental improvement. They did it last year at shortstop.
No one will think of Clint Barmes as an all-star level performer, but when you added it all up, it was a marked improvement.