So I just got a BD-Rom drive so I can start ripping my BDs for streaming to the ATV 2, iPad, & iPhone 4S. My question is, for the movies I have on both BD and DVD, is it necessary to have both the SD & HD versions in iTunes? I know before certain devices were limited in playback ability, but all the newer devices are capable of playing the HD versions, correct? I just figured I'd save some space and get rid of the SD versions of these movies if they're not necessary.