I don't know of any way to tell if a saddle will suit you until you spend some time on it. What works for me on my road bike is this: http://www.serfas.com/product_details.asp?ID=58 --a wider saddle than many use, but I have found that even though I'm a slim build, that I don't feel comfortable on narrower saddles. A local bike shop with a good return policy ordered it for me, and it worked so never had to take it back. I'd highly recommend dealing with a local shop, or company, with a fair return policy--it's cheaper than keeping on buying saddles that don't work, then having to sell them at a used price.