This. almost exactly... and being booed by BGD is a badge of honor. I'd split things up a bit more, though:
Untouchables:
Damian Lillard (PG)
CJ McCollum (SG) (DL would be pissed if we traded CJ).
Ed Davis (PF/C) - (value to us > value around league, need to be loyal to signed FAs)
Strongly Prefer to Keep:
Maurice Harkless (SF) (VERY encouraged by his play)
Al-Farouq Aminu (PF) (value to us > value around league, need to be loyal to signed FAs)
Prefer to Keep:
Mason Plumless (C) (game has multiple holes, but he's still young and a hard worker)
Allen Crabbe (SF) (wants to start somewhere. We may sign him and trade him later)
Kinda Prefer to Keep:
Meyers Leonard (C) (dude still makes horrible decisions and wants to get PAYED, but shooting is highly valued in Stotts offense)
Brian Roberts (PG) (fits system perfected as a 3rd PG, can really shoot. However, for cap reasons he'll get cut. I'd be interested in re-signing him afterward, though).
Luis Montero (SG) (has potential, and my guess is he has no value around the league, so I would prefer to keep him).
Neither Here Nor There:
Noah Vonleh (PF) (freakin' A, I wish this guy would have put it together. He still has value around the league).
Gerald Henderson (SG) (cap reasons - he's gone. Wants to start.)
Pat Connaughton (SG) (I like PC better than most, and I currently see him as meh.)
Cliff Alexander (PF) (maybe he's a beast in practice? Showed nothing this year, didn't dominate DLeague).
OK to keep as 15th man:
Chris Kaman (C) (will get cut. We might resign him afterwards for peanuts, though)
Untouchables:
Damian Lillard (PG)
CJ McCollum (SG)
Ed Davis (PF/C) - when you get a Brian Grant on your team, you keep him
Prefer to Keep:
Mason Plumless (C)
Maurice Harkless (SF)
Al-Farouq Aminu (PF)
Meyers Leonard (C)
Allen Crabbe (SF)
Neither Here Nor There:
Noah Vonleh (PF)
Brian Roberts (PG)
Gerald Henderson (SG)
Luis Montero (SG)
Pat Connaughton (SG)
Cliff Alexander (PF)
Please Stop Playing For Us:
Chris Kaman (C) - just become an assistant coach already, Chris