Well, you may want to check out the Bicycle Place on Grubb Rd in Silver Spring - http://www.thebicycleplace.com/
They carry Nike, Descente, and Castelli, generally, and some other stuff. I think I've seen some Zoic in there for tri-stuff from time to time. Not a huge selection, but maybe something will click for you there. Of course, the men's selection is bigger....Grrrr.....