Crocus speciosus is indeed a wonderful, widely adapted plant, but
it's hard to acquire because of its fall-blooming habit, which
means it doesn't ship along with all the other Dutch-grown bulbs.
There are several named varieties, such as 'Conquest', 'Oxonian',
and 'Cassiope', and one I have from Janis Ruksans is called
'Lakeside Beauty'. Among American suppliers, they can sometimes be
had from McClure and Zimmerman.