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Here's a great paella link (main site is all you need for intro ceramic cooking)-
http://www.nakedwhiz.com/paella/paella.htm Scroll down to the end and check out the link to paellapans.
I received an enameled steel pan as a gift and have no issues. Holds heat well and easy to clean for the next round. I would get the largest that will fit in your BGE at the raised grid level. FWIW-
If you have a large egg this one is great.