IMO the style the Celtics are trying to build is very similar to the formula Golden State has. If you listen to what Danny and Brad say on the subject of style.
The Center the Celtics decide to acquire or draft is key to the style they will play in the near future. The C's need a center that can be best described as a stretch 5, that can defend well. They need a center that can step away from the basket, and draw the other teams bigs, and open up the paint, for the style the C's say they want to play.
Spending big dollars, or trading away valuable assets on a center that is not what they want or need, for the style they desire to play... is short sighted. It makes no sense to spend "big" on a center that you won't play extended minutes because his style isn't what you're really are trying to do.
I rather see them spend reasonable assets/dollars on an active big that does not require the ball to be pounded down low, while still being a solid defensive force, paying him less, and not being guilty about having to play him 23-25 minutes a game.