I have a 2008 Soma Double Cross DC. The bike has been great as a recreational & fitness bike. I use it mostly on-road for regular solo rides that range from 35 to 75 miles. I'll also take longer solo & unsupported rides, up to 130 miles in a day.
My only issue with the bike is that the size 60cm is a bit flexy for sprinting and climbing. I'm 210 lbs and starting to produce some power. My road bike is stiffer, but not as comfortable or as versatile. I would like to retain the qualities of the Soma, including room for 700x35 tires, sports/CX geometry and that great ride quality of steel; but I need a stiffer frame.
I would like a stiffer frame and something a little lighter, any suggestions? I'm happy with Cantilever brakes. I'll keep the Soma as a rain & winter bike. Right now I'm considering the Gunnar Crosshairs in a 620 size: http://gunnarbikes.com/site/bikes/cross-hairs/