Storage question

We have a lot of what I call "archive" SQL data on our current SAN.  This data sits in a RAID5 pool as it is accessed less frequently than current production data.  I am trying to determine what the best Dell storage would be that I could move this archive data to so I can free up space on my current SAN for other usage.  I would need it to work in a MS SQL Cluster as well.  We are currently using 7 TB for this.  Of course I would want space for growth.  I am thinking 10 Gb Ethernet for the connectivity to the SAN.  What soft of Dell storage would you recommend for this scenario?

Thanks!