Just my opinion, of the players that I've seen live:
1. Ray Allen
2. Kemba Walker
3. Chris Smith
4. Emeka Okafor
5. Richard Hamilton
6. Ben Gordon
7. Cliff Robinson
8. Shabazz Nappier
9. Caron Butler
10. Donyell Marshall
11. Cornelius Thompson
Wes and Art probably deserve mention but I never saw them. Rudy Gay never seemed to deliver on the promise of being great - was a very good player, but never great. Charlie was a good player, but was really more of a complimentary piece (never took over a game, but he didn't have to with Mek and Ben). Andre Drummond didn't do enough in his one year (i.e. wasn't great) to be considered.