I went from my Trek standard-issue WSD saddle to a Terry Liberator to my current saddle and reigning champion, a Selle Italia LDY (for "lady") Gel Flow. I liked the first two OK, but I *heart* the LDY.

This is such a subjective question, because I just lent my 5200 out for an extended test ride—it's for sale—and the prospective buyer decided that the bike didn't fit her but asked if she could please, please, please buy the saddle—the Trek WSD I started with! (The answer was yes, of course, because I know how hard it is to find the perfect saddle; now I just need to decide which of the half a dozen or so other saddles we've rejected over the years will go up for sale with the 5200!)

Oh, and btw, LDYs can often be had on eBay for about $50, so they're definitely on the affordable end of quality saddles.