Those are some very nice specimens. As a big fan of the genus Echinocereus I am always surprised at the many species that are present. I just went ahead and bought two plants, one of which is an Echinocereus. The skinny stemmed plant produces a pink flower and supposedly is native to southern Texas. The person from Rio Grande Nursery selling these cacti did not know the scientific name. Probably it used to be called a "Wilcoxia" in the past.
The two favorite plants thus far for me are the E. dasyacanthus var. rectispinus and the E. rayonesensis. Got to love them!