Just to confuse things more, I went with this.
TowerRAID TR8M-BP - 8 Bay eSATA RAID 0/1/10/5/JBOD Performance Tower w/ 6G PCIe Card (Black)
No built in networking as I need the thruput so eSata to Rocket Raid card inside one of my towers. 8 1.5 TB drives.
If you set up sharing on a host then you don't really need NAS.
I like Seagate drives, not a fan of Western Digital. WD for me have been spotty. You'll hear the opposite from others.
For raid 5 you can start with as few as 3 drives.