I think the ideal solution for using an iMac as a DAW at least in my case is a 4TB to 6TB non-mirrored or mirrored Thunderbolt Raid drive for samples, audio recording and maybe mirroring. There is the G-Raid which looks like a solid unit but it's still pretty expensive when you include the cable. You cannot easily remove the drives either if at all. Best price is about $620 for the 4TB from MacMall including cable. My hope is that OWC will sell a thunderbolt Raid drive next year and that the cables start to drop in price. They sell an eSTA Raid 4 TB for $279. A Thunderbolt drive will be more but still hopefully affordable for the average home studio person. I don't want to spend four to five thousand dollars just to get the hard drive bays of a mac pro. I don't like Windows.