I think in addition to the cult mystique of the bike, the '93 and '94 model frames fill a niche: fast frames with clearance for fenders and fattish tires. Some report the tire size is limited, but I think you can still get a 28c in there with fenders. That's why I continue to keep my eyes open for one. There are not many other fast, light frames available with this configuration. I believe the 60's and 70's Bianchis and Cinellis, and some Dutch marques like Gazelle had similar geometries, but they aren't cheap either.

To find something modern with the same geometry, you need to look at the Gunnar Sport, Soma Speedster or Smoothie ES, or the Surly Pacer (though I'm going to guess the RB-1 has better tubing than the Pacer).