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While changing over from my 06 18s to 06 18/19 Rays, I took the time to unscientifically weigh them on my digital bathroom scale with the following results:
the 03-05 track rays were the best
If i was a track junky though, i think i'd look for 17s for cheapness and extra sidewall and availability of race rubber.
It should be obvious, but the '06 rays have bigger tires which of course weigh more. The rays are a good deal lighter than the regular 18s
I was about to type something to that effect. Bigger/wider tires are heavier. Tires with smaller/stiffer sidewalls are heavier. You'd want to weight the wheels alone to get an accurate comparison.