I have riden a road bike, the Trek 1500, for the past three years. I love the speed and the ability to climb hills. I was even able to put a rack on it and commute on it. But after every weekend beach ride, my shoulder and neck hurt and I need to see the chiropractor. I am 50 and so I am now thinking of getting a flat bar road bike. I also want to see more around me since I travel in Los Angeles traffic.

I had an old 2001 Trek 7200 fx, which was super slow and I hated riding. I'm hoping that there have been improvements in hybrids or flat bar road bikes. I really don't want to give up speed. I have researched the following bikes:

Jamis Coda
Giant Dash
Kona Dew
Marin Fairfax

Any thoughts?