Just make sure it's long enough in the back so as to cover your lower back side when leaning out to your handlebars so that area doesn't get wet or doesn't drip down onto your derriere. But you gave some pretty good reasons above for a cycling specific jacket and btw, even if the jacket says it's Gore Tex/breathable, you'll often perspire enough anyway that it can't breath "quick enough" and you can still end up damp underneath.