Personally, I've used "Village in the Dead of Night" from HM (it's very loud very sudden but isn't overly energetic), "The Sealed Away Youkai ~ Lost Place" from SA (it's intro is nice because it's sudden and loud, letting you know you have a call, then it mellows out so it doesn't keep blasting at you), "Eternal Night Vignette ~ Eastern Night" from IN (it's loud but peaceful), and "Eastern Youkai Beauty" from IN (it's short and loud enough that it works well for a ringtone. That said, it's so energetic it gets pretty embarassing if it goes off in a weird place).
I can also recommend "Scarlet Symphony ~ Scarlet Phomene" from LLS. Because that's about the only thing it's good for.