My picks based on what I see as a higher ceiling, not necessarily the play they have shown.
Fant and Jefferson on Defense
Prosise (health a BIG question mark) and mcevoy/vannett (can't decide)
All have pros and cons, but of the new players I have seen, I want to see more of these guys
Honorable mentions:
Pope as I liked what he showed in the preseason, but wasn't overly impressed when he came back. Could be he was still hurt, making health another question mark.
Collins impressed me at the end, but I thought he was trash in preseason and more than half of the regular season. Positive we will see him back, hopefully he can take the next step.