I recently started saving great individual player games in an Excel database..
Here're some record breakers:
Most rebounds: 31, KG
Most steals: 17, Iverson
Most assists: 24, Brevin Knight
Most points: 68, McGrady
Most efficient game thus far:
Garnett: 40 pts, 31 rebs, 7 asts, 5 blks, 1 stl, 6 TO's, 13/20 FG, 14/14 FT's, 27 min
Efficiency: 40+31+7+5+1-6-7-0 = 71
(against Memphis)
I use the NLSC sliders, except 7 minute quarters on 50 speed, Superstar.
Also, I only count stats if I win the game, to prevent stat stuffing at the expense of winning.