Al is a 20/10 guy. He will get at least as much as he is getting now. There are three "top" bigs this summer. Dwight, Bynum, and Al. The Lakers won't let Dwight go, and the 76ers have said said they are resigning Bynum. Al will get paid. I would not be surprised if he gets close to the max, but he will get paid at least as much as he is making now.
The problem with Al isthe same problem Tracy McGrady, Stephon Marbury, etc had. They aren't team players. They provide a net negative to their team. Al will get you 26 and 11, but he will also give up 34 and 15 to the opposition. He doesn't help on defense.
Because of his offense, he will get paid. Because of his defense, whoever pays him will get screwed.