External HD for 4TB storage (raid or no raid)

hi,

on next 3-4 weeks need more storage space. work exclusively photographs (20mb raw files, 400-700mb psd files, large lightroom catalogues).

@ moment, i've got 2tb g-drive serves me well. (g5 powermac, upgrade new macpros when come out).

i'm pondering idea of raid system. recommend?
drobo? oyen digital? qnap? buffalo terastation?

apart connection type (usb/firewire/ethernet...) , type of hd (probably seagate barracuda):
kind of tech specs should watch out actual enclosure?

lot!

 

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