OK, you've heard from the Brooks fans. Now you'll hear from the other side.

If you're getting a Serotta, you've probably got a pretty good LBS to deal with. I would start there. Ask what they have in stock that you could try out. Your measurements are a little on the narrow side, but not terribly so. They might recommend you give Terry saddles a try. If so, you'll get to see how you like a cut-out as all Terry saddles have cut-outs. If you don't like those, Fizik has quite a variety of saddles, none of which have cut-outs.

I ride a Serotta bike as well, and I started out on it with the Terry Butterfly. I didn't know what I liked at that point, but I learned as I went along. I do not race, but I like doing long rides, 50+ miles, so I learned I did not want soft, wide, or cut-out. Much later I ended up on the Fizik Arione, which is flat & narrow & firm, my perfect ride.

You'll find your own perfect ride. My Serotta is very special to me, so fast & light. I wanted the saddle to be like that, too. Give me new technology, it's come a long, long ways.

Enjoy your new bike when it comes in. You picked a winner!