I have the San Marco triathlon saddle which is use for TT's as well. It's good as it has a long and gel padded nose. You'll find most good TT suitable saddles will have long noses, due to the agreesive positioning most tend to adopt. The amount of padding/gel is simply personal preference.
No reason for a TT to be all about pain. I certainly wouldn't want to do anything above a 10m TT on anything less than a perfectly comfortable saddle, especially for a 100m TT.
For note my TT bike is also my triathlon bike.
