The 28 is also fine for general touring, in my experience, although it is possibly a little harsher. It depends on how much you want to load up. If you are touring with a light load, they are fine. If you are trekking with heavy loads, probably not.
I have just taken delivery of a pair of the full black sidewall 32s with the reflective strips on either side. I am interested to see how they last considering the claims about sidewall splitting -- which I have not experienced with previous sets of TTs with the tan gumwalls.