If your planing on doing any Ceramic coat or anything, I would thing about VHTW, rated for 538 C I get mine form here
http://www.tevelec.com/CatalogProduc...ProductsID=119 About $1 a foot CDN for 18Ga which is a really good price. The elements get alot hotter than your oven temp, and this can easily burn off lesser insulations. I have already had a run in with that.