I'm starting to think, the best you can get for full range coverage for Tracking...so maybe RP8's....especially hip hop.
for mixing it seems anything works....Auratones come to mind, or Rami mentioning using auto speakers last eyar, or Lord ALge using Radio Shack Optimus 7's on a gold record....bounce around, try anything form EarBuds to Ipods to Focal's...
then the mastering stage it's back to the best you can get. the gorgeous B&W's or what have you, seems in the pics its often like HiEnd HiFi speakers in some cathederal type room.
usually in HR its an 11x11 drywall.