My last pair of ds trainer xi are almost worn down and I'm not sure which shoe to buy. I've used the ds xii before and I didn't like them; i thought they were really stiff and not nearly as smooth. I've heard some mixed things about the ds trainer 13 but im not completely sold on them. I do occasionally get some arch pain so I dont want something too stiff or with too little support. Anyway, what do you think about the 13s and what are some other substitutes for the 11s? I've heard good things about the speedstars, nb 902 and tangents but im not sure which would be good to buy. Also could you please tell me how the sizes run on whichever shoe you recommend compared to that of the ds trainer? Thanks