Theres a new series going to come out. Definetly what your looking for though. Omamori Himari, I think it's coming out in 2010. If you want to watch one now, then watch Darker than Black, it has a similar atmosphere in it but it's a LOT more noir. I would also recommend Zero no Tsukaima though i'm not sure really what your looking for since I didn't finish shakugan no shana even though I know and heard it's real good. If you give me what genre your looking for, that will be a lot more helpful for me to be more accurate.