If that's all it's about for him, that he has to have more, then I am not sure he's the guy. I mean, if you got paid 30 a year and Seagar got 32, that's not acceptable? To me that doesn't scream "team guy". How much is enough? Ego guys like that don't really get the fanbase on their side should they struggle. Or is it that he really doesn't want to come here and only will if he gets more than every other shortstop, then I am not sure I'd want him either. He's good, but is he that good? I want him to WANT to be here. If that's not the case, go for Story or Baez.
There is another angle to consider here. If you want to keep this manager around after this season, I think you'd better get a real upgrade because there's probably 3-5 good teams that are close that might come after him after this season.