Will this be a dedicated storage drive or will Windows/programs be running off this. If its just a storage drive (documents, music, etc) then the Green drive as it has the larger capacity. If its a main OS drive, then get the black.
Or secret option number 3, a Seagate Barracuda 2TB.http://www.ple.com.au/ViewItem.aspx?InventoryItemID=608792&CategoryID=243
Just as fast as the black, double the capacity for $5 more.