Span have an impressive range of storage hardware from SOHO to serious enterprise-class equipment. They are happy to deal with retail customers, and the pricing, service and advice I've had from them have been great; they ship items quickly and everything I've had from them has been good quality. They are also a great source of hard-to-find storage products and accessories, for example multilane SAS cables for old RAID cards.
I would highly recommend these guys.
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