I'm looking at getting a new saddle after suffering numbness in important areas on long rides with my stock saddle. I've read good things about Selle SMP saddles here and elsewhere and think I'll give them a go. From what I can see they're all essentially the same design and simply vary in size, padding and material/weight. I'm therefore thinking of buying one of the cheaper saddles and if it suits me then later buy a better one for my road bike and consign the cheaper one to my hybrid. I'm reluctant to fork out the money for one of the better saddles only to find in a few weeks or months we don't get on. Would this seem reasonable or is there more variation between models than I'm aware of?