Go EMC. Support is solid and the units are well designed.
But-But - they run Windows on the low-end stuff, don't they?
;-)))
I think they run embedded windows on some of their high-end stuff as well.
If done properly the embedded OS in the device is of little consequence, you'll only ever interface with it through a web interface or standalone client and updates are done through "firmware" upgrades.
As long as it performs and scales as advertised I don't care if it runs AmigaOS under the hood.
-Ross