I have a Selle Anatomica C-Series on my Cervelo, which is light, has no padding at all, and is within 90% of the comfort level of an SA leather saddle. As with things that go fast, saddles follow a similar three rule, something like "Cheap, light, comfortable... pick 2." That C-Series would never be accused of being cheap. But I have not for a single second regretted spending the money on it.

If you like a saddle, do not replace it just because you think it's too heavy. That weight is meaningless.