Enterprise, not Green, and not sure you want 3TB as those tend to be mostly slower or variable Green models.
WD / Hitachi / Seagate
You need 2TB or larger drive though for backups now so that you can clone and backup and 3TB gives you room to grow, but not for your array.
4 x 2TB WD Black would probably be a good choice for the array. Then 3-4TB drive(s) for backup purpose.
3TB is still unreliable and has issues supporting SATA II and Windows through bootcamp.