I use the piano riff from "A Thousand Miles" by Vanessa Carlton. It's a nice melody and the tonality makes it VERY easy to hear even in loud situations.
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Default would be "Never Too Late" Three Days Grace...
The psuedo-special-someone is "Broken" Seether & Amy Lee...
...as well as some other random ones for other random people.
My default ring tone is "Linus and Lucy with the Band" (arranged by Vince Guaraldi). My fiancee has her own ring tone, "Rag Doll," by Aerosmith. For an alarm, I use "Lionheart," by the Angels of Venice.