My favorite warp song would probably be Prelude of Light. I like the connotations, the sound, and the place to which you are warped when you use it. Who doesn't like the Temple of Time, the pedestal, the music, the three spiritual stones, etc?
My second favorite would probably be Requiem of Spirit. It also has a very "bright" sound, and a sense of magic to it. There's something calming about the song, and warping to the area outside Spirit Temple looks quite nice. There's a nice little oasis.