NetApp has a long history and good rep. Currently has contracts with the government. That is what we use here on Fort Sam. Check out their website: http://www.netapp.com/us/Good luck in your decision
There’s lots of vendors that you can look at. NetApp, EMC, Hitachi, HP (3PAR) as well as some of the smaller vendors like X-IO, FusionIO, Pure Storage, etc.
Dell Equalogic is a good choice too, if u dont want to pay extra for software options like snapshots , replication etc