So, the good news is that I've found the ultimate thin nylon spatula: the Hutzler.
http://www.hutzlerco.com/products/i/62/The bad news is that, in the last 6 months they haven't succeeded in finding a retail distributor, so you can only buy them online, and from only one place:
http://www.gourmac.com/nylonturner.htmlThis also means that if you want one, you'd better buy it soon, because Hutzler will probably go bankrupt or stop making them. I've stocked up and bought 8.