My three pairs of Castelli Y2Pro's are wearing out. Two have been just great, but one has a hole in the pad, the later one I got started unraveling the minute I had it. This was an ebay purchase, so caveat emptor applied. So what bib shorts to get:
Assos FI.13 S-2 Bib Shorts. I have used Castelli's for a long time, but many folks think these are the best shorts in the world, but they don't wear very well according to roadbikereview. Heck, guess that $260 from Biketiresdirect They are 90 pounds from Totalcycling or $160. Mediums fit 30-34" waist.
Castelli YPro3 Bib Short. Lists for $175. Excel has the YPro3 which doesn't use YFuso for $175. Large fits 32-36" waists.
Castelli YFuso. Totalcycling. gets you last years Castelli Yfuso for 75 pounds or $137 for the 2004 model, although these YFuso's have been less popular on Roadbikereview" because they are thicker.
Finally, cyclingnews.com has a bunch of reviews of shorts I've never tried including the
Cannibal shorts which I might get just because the name is so amazing.
Giordana Tenax. Another short that fit well for him. Got 4 1/2 stars.
Louis Garneau Power Bib. This big also got 4 1/2 stars but is more expensive than the Giordana
De Marche Contour. Like them, main complaint was they seemed to thin to be durable. 3 1/2 star because he suspected the durability.
Canari which is a speciality brand that they found very comfortable. 4 stars.
Sugoi Evolution. Super thin chamois, but he liked the fit. 4 1/2 stars.
Another great option are the Santini CX Professional bibs; you can buy 2 for $116 US at http://www.bicyclinghub.com/buytwosancxp.html. I have been very impressed with both their comfort and durability. They are even comfortable when training in an aero position.