I found SLRs perfectly good, if anything more so than XPs, as they had more give.
Then tried a Specialized Toupe and that was vastly superior to both!
However, they don’t last very long! I used to wear through the cover on an SLR within a year, and snapped 3 Toupes over a couple of years (although they were all warrantied). Then switched to a Phenom SL, which is heavier (more like an SLR XC), but really comfy.
Also… some recommendations above are based on road bikes, which isn’t really relevant, much less weight on your arse! Go with the demo saddle option, but I wouldn’t go back to Selle now.