You can narrow your choices down a bit depending on your
anatomy -- how wide are your sit-bones. If you think you're
a little wider than average, some good saddles under ~300 gms include
the selle italia prolink and max flite models, the koobi enduro,
several WTB models (they have saddle dimensions on their website),
and I'm sure many others. However, I think most road saddles
are targeted for the narrow-of-beam people, so if your rear end
is not-so-wide, there are an unbelieveable number of choices.
Check out roadbikereview.com...