I get bored just listening to instrumentals, really. My favorite OST, to be honest, is from Prince of Tennis. It's not even for the opening and ending themes, it's for the character songs! If you pick the right characters, anyway...some characters don't have many tracks available due to lack of popularity or some other reason (which is disappointing because some characters have more tracks when their seiyuu are horrid at singing, although it was rare in this series).