I ride an Ergon SR3-L Pro Carbon on one bike, if I remember correctly I found it on close-out page, Nashbar -- cheap. I picked it up because it has a very flat top, sllght downturn toward the nose, and was nice and wide, around 155mm.

I like it a lot, and it has very little padding. It flexes well on bumps, so it is somewhat forgiving. But, if I got a small or medium I think I would be unhappy, pretty harsh edge fall-off on those bouts. So, if it was a close call I would go larger.