Have you guys tried Selle An Atomica? I've been using them for years on all my bikes. The cons are they're heavy, and can stretch, especially in hot and humid. That said, I've had one of mine since 2007, and I'm guessing it has upwards of 8,000 miles on it. It's comfy, so I don't mind the weight. I think my sitbones are around 145mm c-c.