I am looking to get a RAID 1 mirror solution to free up space on my internal drive. This drive will only be used for iTunes (iPhoto will be left internal) and the data on the internal will be backed up to a separate drive via Time Machine but this data will not, hence the RAID 1 mirror. This is my first foray into RAID but from all my research looks like the best option. I am looking at getting a NewerTech Guardian Maximus RAID 1 case from OWC, just the case, though they do have a couple other options that are slightly cheaper. Thought about the Drobo but just don't trust it. Would love a OWC Mercury Elite-AL Pro Qx2 but I can't afford it. I am then looking to put 2 2TB drives into the RAID case. As this drive will house all iTunes which is always running and movies and music are often streamed to my Apple TV, and I have a growing collection of HD movies now too, I am curious on the need for a pair of 7200 vs. 5900 or 5400 drives since the files are 2-6 GB in size. Also looking at manufacturer. Seagate, Western Digital, Hitachi, Samsung. Please any feedback and votes would be great.