I just don't see a huge need for that many internal disks anymore, unless your doing really large video operations. In that case, a Mac Pro would probably be well worth the price in encode time decreases alone. With a NAS, you can get quite a bit of storage in a nice compact box to shove in a closet, with files easily accessible to any desktops or laptops on the network. And even going direct attached, you can get 1.5TB with a single drive for around $1/10GB.