Well, I'm not sure about Top 10, but I give you my top 3: Space Adventure cobra (with beautiful OST from Yello https://musescore.com/user/11173371/scores/3789856), Evangelion (ost from this anme is beautiful thing too https://musescore.com/sheetmusic?text=evangelion) and Hellsing TV version (great music by Yasushi Ishii https://musescore.com/user/14505396/scores/5078774). Enjoy!