I've currently got 180mm Truvativ Stylo SS cranks on my Inbred. £100 or so with BB from Brant at On-One.
Failing that buy normal cranks and some narrow chainring bolts. Remove inner and outer rings and fit just the middle ring using the narrow bolts. You now have SS cranks.
Truvativ sound perfect, especially if there's an ISIS version - I've got ISIS on another bike, and Truvativ support it. As long as I can get a bb for my old-school 73mm bb shell. Got a link for Brant?