There are far faster drives then the ones you are talking about out there that will come close to saturating a SATA 3 connector. SSD's do mid 500MB/s transfers.
My current setup with 2 SSD's in a raid 0 do over 1GB/s transfers.
I do realize there are faster harddrives & SSD's out there. I use SSD for my system drive as of now. However, I am looking for speed as a secondary to reliabilty and capacity. Theres no way to get 3TB of Storage in an SSD for the price I just paid ($99.99ea) @ NewEgg... So, essentailly I'm getting 3TB of SSD speed storage for $300.00. Considering the Fault tollerance of Raid 0 with 3 drives being 3x's as likely to fail than 1 drive is why I went with enterprise grade HDD's.
Thank you for clarifying and answering my Q's!