New York can offer him 2.5 Mil to start at shooting guard. Spurs can offer him 3 Mil to start at small forward. He can start at small forward for the Lakers. He can also start in Dallas.
If he is healthy, and focused I would love to have him. But there is little chance he takes the vet min to come off the bench here. More likely he will use Boston's interest to leverage more money from a bad team or convince San Antonio or New York to use their exception on him.
I don't think NY would offer him that though. I think they are stashing that to throw it at one of the guys from China.
The Spurs are a possibility, although they are pretty deep on the wing (Jefferson, Ginobili, Neal, Leonard, Anderson), and I think they have a much greater need up front, and they will save the MLE for a big man.
I don't think Pietrus starts for the Lakers. Unless he returns to his form of a few years ago, he would be behind Metta and Barnes, and possibly Kapono.
If one of those teams reach into their pockets, yeah, he will go there, but I really doubt that happens, and I think he will go to Boston, where he will be at worst the 4th wing on a team that needs to play 4 wings, and will likely be playing a lot more due to injuries.
He is going to be playing for his next contract, so an extra million or two this year won't make a difference if he doesn't expect to get the playing time.