I vote carbon steel.
Here's a link to medium sized, carbon steel, crepe pans:
Matfer Bourgeat BOURGEAT BLACK STEEL ROUND CREPE PAN WITH IRON HANDLE
Here's a link to larger ones:
debuyer | Kerekes Bakery & Restaurant Equipment, Inc
(I really like the Bourgeat crepe pans and culinary cookware as an e-tailer. In general deBuyer are the next step down from Bourgeat, but I don't suppose that matters at all in a crepe pan. They don't see any rough duty. I haven't had any experience with kereke's -- it's just the first hit for a 12" pan I got on google. For this purpose, as long as it's carbon and the right size, the cheaper the better.)
I disagree with Chris to the extent that the first crepe, and often the first two are a waste anyway. Think of them as an opportunity to make your dog happy. Once you've got a couple off the pan, it will behave beautifully -- even if it was hung for a long time and regreased just before cooking (no need to cure again).
The primary advantage of cast over carbon is temperature stability at the time the food is introduced. Not important with crepes, because they're not much thermal load. Cured carbon is every bit as "non-stick" as cast, and requires exactly the same amount of care. Carbon is just so much easier to handle.
Modern commercial creperies in France, Canada and elsewhere, even cart mounted, use electrically or gas heated cast-iron griddles. You don't often see pans anymore. Here's a link to an e-tailer with the sort of things you do see:
</title></head><body>" + printReady.innerHTML + "<br><br><center><font size=-1><br>Client's name goes here!</font></center></body></html>"; PrintFrame.focus(); PrintFrame.print(); } else if (ns6) { parent.PrintFrame.document.body.innerHTML = document Heavy griddles make sense in a commercial setting because they can be heated, kept hot economically during long idles, and are ready to go when the crush comes. Pans of any sort take a certain amount of fiddling before you get that good "assembly-line" action going. Plus, you can't just leave them on the heat unloaded forever. Warp's 'em.
BDL