I only attempt cider once a year.
One of my LHBS gets a special blend of cider from a local orchard specifically for fermenting purposes.
I haven't found the need to be so picky on juice, but then I've never find any juice specifically labeled for fermenting purposes. The unpasteurized juice from a local orchard is very nice, but I've found that any preservative free, unfiltered juice/cider will work.