Since the Serfas saddle worked for you, measure it in as many dimensions as you can, using both a ruler and calipers, and compare it against other seats at the LBS and/or ask members here to post the measurements of their saddles. That should give you a good idea anyhow. Someplace on here I posted the measurements of my 155 Lithia, but you've already tried that one.
Here it is, for reference of what I measured.
ETA: maybe a firmer Bontrager seat might work for you, too? According to their website they have an Unconditional Comfort Guarantee.
Last edited by OakLeaf; 08-06-2008 at 12:36 PM.
Speed comes from what you put behind you. - Judi Ketteler