If it was 18-28, people would be falling all over themselves with helpful advice to the FO. Some are anyway. If someone wants to happy dance about this, let them.
If Panda can play third base, I refuse to worry about Sano. Things will sort themselves out; depends on if the team remains in contention. I vote they do, which means Plouffe stays and Sano waits until September.
I wouldn't change much yet. The two areas this team needs filled are reliability in the bullpen and left-handed power hitting. The first can be filled from within the organization and I'm willing to give Arcia and Vargas one more look before trading for the second. Clearly one of the starters (probably Pelfrey) will have to go somewhere to make room for Santana, and Milone is definitely forcing the issue about a second one; which may turn out to be Milone himself. But I see no reason to rush things.