I'm still on the search for a great nude heel. I'm thinking patent but non-patent is fine too. Here is the latest contender - Stella McCartney's kitten heels.
I think they'll be great for walking and have an asymmetrical cut to the toebox (very similar to my favorite Louboutin Helumt, very feminine).
I was thinking a pump rather than a sling-back but these are pretty good. One to add to the list!
Stella McCartney nude patent kitten heel via Net-a-Porter - $645