I am interested in buying a grill pan, since I live in an apartment where outdoor grills are not permitted. I have been looking around and I am having a tough time deciding between the Lodge 10-inch square cast iron grill pan and the Calphalon Unison 12-inch circle non-stick grill pan. At first I thought the cast-iron since they are supposed to hold up well and have good heat retention. But then I read Cook’s Illustrated’s review of grill pans and they basically say to not buy cast iron (due to clean up). But… I also thought non-stick surfaces were not good to heat to high heat, which I assume would be needed to get good grill marks? So I am a little torn on which to choose. Does anyone have any recommendations between these two or any other grill pan?