Quincy Miller is the only elite SG or SF prospect I haven't been able to watch live yet, but based off his stats and a few highlights, I'd say he's been the most impressive, thus far. Except for maybe Jeremy Lamb.
IMO, Miller has the most complete upside of all SF's (or SG's) in the draft/college. If he works hard and plays within the team, he could move to anywhere on the board. It's a long season and all these opinions will change a dozen or more times over the next several months. I was perplexed all game long as to why Kidd-Gilchrist wasn't playing his game .. he really is unstoppable .. hmmm, will have to see over the next few games.
Ronnie Brewer with a handle and a J isn't a bad thing.
Defensively I thought Kidd-Gilchrist was the best on the floor. He really changed the mindset of the players around him. When he left the floor, it seemed like the defense did as well. In the 2nd half, when he was assigned Kansas' PG, Kansas fell completely apart. That really excites me. What didn't excite me was his offense. All game long I waited for a moment that he would take over or catch fire and it never happened. That worries me. I hope what you say is true and he breaks out against other teams.
I would first see if Anthony Davis can play SF before trading Kanter. Davis is thin and would be a Lamarcus Aldridge-type PF. Take Davis to play at SF and take a PG with the second pick.
On a related note, anyone remember how talented and yet how bad the Phoenix Suns were before they brought back Nash to play PG back in the mid 2000? They had good young talent like Joe Johnson, Q. Richardson (back when that wasn't such a bad thing), Shawn Marion and Amare Stoudemire, but they were in last place in their division because their PG was Stephon Marbury. I'm a bit worried that the Jazz might be similar unless we get good PG play.
Davis is a PF for sure. Like Garnett I think he could be a SF, but it would a disservice to him and the team to play him there. Yes he looks really skinny, but I think he could obtain a Garnett like physique. He would be a risk, because if he wasn't able to bulk-up and add skill to his game, he could be a bust.
EARLY (early, early) in the season I'm most impressed with Q. Miller, Davis, and J. Lamb. Again, the opinions will change plenty, but these three, thus far, have been better than I expected this early.