Brooks makes a good saddle but there are other good options. You have probably seen the Brooks B17 which would appear bulky on a race bike... check out the Team Pro, Swift or Swallow models (used).

I would recommend visiting a Specialized dealer & sitting on their butt-meter to determine your sit bone spacing... that will help you figure out the size saddle you need. The Terry Fly series of saddles is often mentioned as a comfortable option and it comes in @ your price. Fizik, Specialized, and Selle Italia are other brands that get mentioned often. You'll want to take the saddle on a few long rides, hopefully your local shop has a demo program (you may need to pay a little $ to demo).