I think the handlebar width on the Trek FX bikes is ideal for hybrids, or is at least a good start for finding the ideal bar width. The Bontrager isozone handlebars that come on most Trek FX bikes are 60 cm wide. Giant makes a handlebar that is 61 cm wide, I think those are the ones they put on their FastRoad models. Origin8 sells a lot of flat/riser handlebars with varying widths. If you want to try narrow bars, they even sell one that is 46 cm and a riser that is 54 cm. They make those bars mainly for fixed gear bikes, but I don't see why you can't install them on a hybrid bike.

Bar ends have disappeared on mountain bikes, but manufacturers are putting them on their flat bar road bikes. For instance, the Giant FastRoad and the Specialized Sirrus bikes. The higher end Felt Verza Speed flat bar road bikes also come with integrated bar ends. I for one am looking to get bar ends installed on both my flat bar Madone and Giant Roam.