Agave attenuata...soft, lush growth and no spines, but it is frost tender.
I'd love to use some agave in your yard!
agave -- olivia hamilton / aloha olive -- http://instagram.com/p/qumRJLLX1N/ -- http://femme-minimaliste.tumblr.com/
Agave 'Blue Glow' Mais Mais
RH Source Books
Spiraled agave, Alpine species, loves light shade and grows through winter, 60 to 100cm rosettes, showpiece species.
Restoration Hardware catalog
Native Agave Garden "native to the southern and western United States, Mexico and central and tropical South America"
Agave lophantha 'Quadricolor' More