Sci-Fi? I wonder if you've watched these ..
To Aru Kagaku No Railgun
To Aru Majutsu no Index
Disappearance of Haruhi Suzumiya
Vanishment of Haruhi Suzumiya
Sword Art Online
Darker than Black
Toki wo Kakeru Shoujo
Can't think of anything better then these but I've lot more to recommend !