Mike’s answer
I don’t like it entirely, but, Paul Millsap.
With the Rooster and Wilson Chandler likely out of town, Millsap brings a powerful forward who is known for his defense. Denver has the money to spend and can afford providing him a 3-4 that will give him security in his old age.
Who knows, Denver might actually get value out of a defensive hit man free agent (thinking back to Igoudala, Dahntay Jones, Kenyon Martin, etc).
However, a lot of this will depend on if Gallinari will exercise his player option this summer.
If that is the case, then Denver will have a lot of freedom to pursue someone of the likes of Millsap.