Racing in the eighties (at 170 pounds) I trained on 400 gram rims with 36 holes. I raced on that combo as well, when the roads were especially bad, but for most road races and crits I used 330 gram rims with 32 spokes. That was pretty typical, although lighter guys often raced on lighter rims, like the GEL 280s, and often with 28 spokes. I personally felt fine on 400 gram rims with 28 spokes, or 280 gram rims with 36 spokes, but found light rims with low spoke counts flexed enough to make me nervous.

On the track I used the 400/36 hole combo indoors on tight tracks because lateral stiffness was so important. For outdoor tracks I could get away with 330s and 32 spokes for most events, but again, lower spoke counts started to feel weird. The 400/36 hole was apparently universal on indoor tracks even for very light riders, but on the outdoor tracks I saw a lot of very light equipment being used, like the Roval stuff, etc.