Velociraptors's don't have to be loud if they're mounted right. Not sure if the forum rules permit sending one to another forum but there is a lot of silencing drive info on
silentpcreview.com | Index .
Seagate's main product line in SATA is the Barracuda. It comes in several incarnations based on rotational speed and generation, and whether it is consumer or enterprise grade. I have 4 Barracuda ES.2 drives in raid and they are fast, quiet and low powered so they fall outside WD's pingeonholes