I'd go with the Coda. As much of a Trek fan as I am, the 7.1 is the rock bottom of the Trek FX lineup. You can get better components by going to a bit lesser known brand. Jamis, Fuji, etc.

That said, if you're looking for a solid commuter, the 2010 Trek PDX is essentially a FX with disc brakes, and a much better wheelset. I have one, well, at least it started out as a PDX, only thing original at this point is the frame/fork.