I was only kidding about Posey, by the way.
I think to have a good bench you need at least three players who can maintain the level of play close to what the starters give you.
They need to cover the forward, guard, center positions.
Finally, you would like them to provide a spark to the lineup (like Vinnie the Microwave!).
I think with Nate, Marquis and Sheed we match up favorably with anyone else.