In reply to humptydumpty:
Not sure if this advice is too late, but if you can take two halves rather than (or as well as) a 50m single I would personally, although you can do all the routes you've suggested on a single. However, Zelda (esp. the top pitch) might feel quite "draggy" on a single rope, and more importantly if it goes pear-shaped (e.g. it starts raining!) I don't think you could retreat easily after the first pitch of Zelda with a single 50m. As stated above, for Wintour's Leap South Bay and Far South Bay the best descent is scrambling down the Easy Way Down (with an easy scramble to the top for the latter) rather than abbing, and the ab of the Longstone Pinnacle is short and easily doable with a single 50m rope.
One place you definitely should NOT try to climb on with a single 50m rope is the North Wall at Wintour's Leap, which does have some good routes in your grade range (Left Hand Route, Nibelheim, Joe's Route etc). Following a change of ownership of the house on top of the cliff you can no longer top out, and both abseils from the Great Ledge (the effective top for most of the routes) are considerably longer than 25 metres. It's also worth noting that a single 50m rope doesn't quite get to the ground for the longer routes at Shorn Cliff, including the big slab routes (e.g. the Laughing Cavaliers and One for All) in the Great Central Cave area, and there is no viable alternative descent.
Cheers
Rick