Najera wouldn't be on the books for 4 years. His contract is only guaranteed for the first 2 years. That's why the Nets signed him this off-season, they wouldn't give him a contract that would eat 2010 cap space.
This is an extremely lateral move. I prefer Scal to Najera, I wouldn't mind to look at SW (on whom I see more a clueless and bad basketball player than any semblance of defensive potential, except shotblocking ability) if the price was POB and I'm neutral between Pruitt and Williams.
Not worth the trouble of adding 3 new players to the roster at this moment of the season when we're talking about players with so little talent who probably wouldn't get a meaningful minute of play-offs basketball.