Couple things:
1) I find it extremely hard to believe the sonic differences between various CDR brands are detectable by most (or all) humans, if they even exist at all.
2) Hard disks are nice, but try playing that music anywhere other than home - CDRs are, obviously, portable.
My recommendation? Don't waste your time looking for the "best-sounding" CDR, find the best price on a good-quality product and spend your time listening to music.
-RW-