even with good insulation, you'll have massive amounts of heat transfer in your growbeds..
i'm planning on trout after my basement pond is built, but in the meantime i have yellow perch and sunfish (my bluegill supplier gave me a mix, was supposed to be hybrids)
bluegill might be a good choice to start, if provided a good food (high protein fish food) they will grow a pound in 12 to 18 months. will be ok with a wide range of temps (growth slows when it's cold) and are pretty hearty overall
i'd like to try catfish, but the wife is alergic to them, haven't read much on them because they aren't a consideration for me... whatever you pick, there's lots of info out there, keep us up to date!