I'm in the same boat. I'm looking at saddles now. Its all about the width of your sit-bones. Bontrager and others have a "butt-measurer" that you sit on and it leaves an impression and then you measure the width to determine your "size".
I wonder if our butts change over time? Saddle brands and models that used to fit don't any more. Also, too much cushion means that the cushion gets pressed toward the center giving more pressure on areas you don't want.
You are lucky I have been waiting for 2 months on an 18" Puglsey complete. Due in June no less !!!
I have has luck with Specialized seats. They seem to have done loads or research on circulation. Plus my LBS, has a whole rack of try-out seats. Check one out, ..buy it if you like it or bring it back to try another.
Mark