Not much.  Not much at all.  Gallo (or Randolph), Curry and a future pick could be enough.

Think about it.  If Carmelo makes it abundantly clear to the rest of the league that he wants to be a Knick, what other team would trade for him now just to lose him during free agency this summer?  Only a team that is willing to take the risk that they can convince him otherwise—that they have a superior roster to the Knicks.  Perhaps the Bulls can do that.  Maybe Orlando.  Maybe the Nets.  But really, this could be a one team race to obtain Melo if New York is where he wants to be.

And, all indications are that Melo only has eyes for New York.  He just got married to his wife who’s in the entertainment industry and is from the city.  He has his own roots to city (born in Brooklyn), the state (went to Syracuse), and the east coast.  He has a great relationship with Mike D’Antoni where he featured as one of Team USA’s three best players.  His marketing opportunities would explode as a Knick.  He knows the Knicks will spare no expense (which is more than you can say for the Bulls and Orlando).  And, his chances to win a championship might be best in NY.  Here is the Knicks roster if a Gallo/Curry trade goes down:

PG: Felton / Douglas
SG: Azubuike / Walker / Rautins
SF: Carmelo / Chandler / Fields
PF: Amare / Randolph
C: Turiaf / Mozgov / Jordan

That’s solid.  That can compete with any team including the Heat.

It should be noted, I’d really, really, really be bummed to trade Danilo.  I truly believe he has borderline all-star potential and is a great fit for SSOL, especially with his stroke.  But, you’ve gotta give something up to get something.  I’d add Walker and/or Chandler, too if it would sweeten the pot.  I’d be very reluctant to give up Randolph, though, since he’s so multidimensional which might be just as important as outside shooting to D’Antoni.

The Knicks truly have the upper hand in this situation.  Carmelo wants New York.  Denver doesn’t want to end up in Cleveland’s situation.  The longer this goes on, the less Denver will be able to get back.  At the trade deadline, a team surging for a playoff spot or a team thinking this is their one shot to put them over the top, might pull the trigger on renting Melo.  But how much would they really give up?