I would trade basically anything but the Nets pick for Marc Gasol. My dream team for next year is:
Smart / IT
Bradley / Hunter
Crowder / James Young / Luwawu*
Ben Simmons / Sullinger
Marc Gasol / KO / Mickey
Basically, trade our pick next year + the ability to swap it with the Nets, Amir's waivable contract, Rozier, Memphis's own 1st round pick back (likely in 2018) and the Dallas pick for Marc Gasol. That means we'd keep our pick this year, so I'd like Luwawu at where we're drafting. That's a pretty solid team, although we're still not going to win a championship with it. Gasol is 30 though, so we'd have to make another big move right away. I wouldn't trade for Gasol after this off season, as he will be too old.
Gallinari would be nice, but only if we got him in February for peanuts. I don't really want to give up much for him, but he'd be a great add at the same time.