I saw JMR Silver Stor at NAB and I have to say the machines are extremely impressive. Especially the inbuilt 8bay RAID. There's also a 5.25" slot under that for an in-built LTO if need be.
They told me they would not only Hackintosh it for me but that they would support it. After seeing what they had running at their booth I definitely believe them. Check em out, I think it's a good option possibly.
I do not work for the company, was just impressed by what I saw and heard.