If we only look at price per GB, Seagate's GoFlex Desk drives with the Thunderbolt adapter are the cheapest--especially the 3TB and 4TB models are very affordable when compared to other options. However, keep in mind that GoFlex Desk drives feature only a single 3.5" hard drive, whereas all other solutions have at least two 2.5" or 3.5" drives. Running two drives in RAID 0 increases the performance (particularly sequential transfer rates), hence the GoFlex Desk should be the slowest drives in the comparison.