I have been having a hell of a time finding one that doesn't f**ckin' hurt!
Swapped out four so far, in order of ascending quality:
An old Avocet Touring II
A low-end Selle Italia
A high-end Velo Forte
A Vetta Tri-Shock
They've all kind of sucked, despite that I've dialed in fit and angle, and I wear bikeshorts.
Keep in mind that I've acquired these all for free or cheap, but I'm now willing to spend some $$ (two dollar signs, not three) on something that is rad.
I ride a lot.
Please offer suggestions or personal experiences and, on behalf of my special stuff, thanks.