A-719 are the best touring rim around. They are made of Maxtal which is stronger than the aluminum used in most rims.
I have a set on my touring bike that I've ridden over 10,000km and not broken a spoke and only trued them once. I weigh 230lbs and carry a 40 to 50 lb. load.
I just built up a set of XM 719 disk for my mountain bike to tour off road. I used DT Alpine3 spokes on XT hubs. The wheel set weighs 2100gms.