I know some companies make the +2+1 arms, and dont advertize them as so. In my case I really wanted the Denton arms when I was looking but I thought they were only +2... called them and to my suprise it's an advertizing mistake. They are +2+1. So you may want to call first.
You want your front end wider than the rear end slightly to ease recovery. It's harder to flip under hard, rough cornering becasue turning radious in the rear is reduced, thus reducing the posibility of your rear end passing your front. The back end tends to disagree with the front, so you want the front tires planted.