I'd rather get something of lasting value for Lee like a pick, a young player, or salary cap space. What's a one-year rental of Boozer going to do for us?
You answered your own question. Maybe the Knicks could beg for their 1st round pick back from the Jazz too? It would be ironic if Boozer/LeBron reunited in New York next season.
But we're not shedding any salary unless the Jazz take on Curry and/or Jeffries, which they probably won't. If we sign Lee this season he's only getting a one-year deal. So we would be trading away a one-year player for a one-year player.