Thanks for all of the input. after further research. I decided on the Mavic CXP-33s with the ultegra hub. Considering that my bag weighs around 15 lbs or so, the extra strength that these rims provide seem to help with the additional weight. I picked them up from BWW for about $300.

I couldn't justify price wise the additional benefits of upgrading the hubs from ultegra would provide me, even in the long term. My back up bike is a cannondale criterium 3.0 with 105 hubs matrix iso-II rims circa 1989. So any thing new is an upgrade for me.

I'll let everyone know how this works out.