The best bib shorts are the Assos --- they adjust to accommodate torso length. However, they are an investment (a worthy one, if you're a serious rider, particularly if you're an endurance cyclist). I give them five out of five stars in every category (fit, styling, fabric, quality, chamois, comfort, etc).

These http://www.teamestrogen.com/prodSU_39390F.html are great and a bit more modestly priced, relatively speaking. The chamois is not minimal but it's not like a big bad 1970s maxi-pad, either. Good for longer rides. My only beef w/these shorts is the fabric---I like my shorts more supportive in terms of fabric compression. Some of this might be a vanity sizing thing--I am petite (not anorexic thin, muscular but small boned and fit) and it's getting increasingly more difficult to find stuff that fits. But I digress. That said, the Sugoi shorts are fine in terms of fit and support. I own three pairs of these, which shows how much I like them.

I don't have issues w/un-bibbing if I have to answer the call of nature, so I'm not going to try the drop tail style bibs. FWIW, I always wear a base layer on top, even in summer.