I currently have a "decent" (notice the quotes) infrastructure as my NAS at work, but have been tasked with looking up solutions for a Tier 1, VERY ROBUST, solution for a new SAN.
We started off with an IBM box with a 3ware RAID controller running on iSCSI LUNs. It worked OKAY for a little while, but was never meant to extend as a FILESTORE (it was originally commissioned as an intermediate backup solution).
I am not against FIBRE, but currently have the iSCSI working okay, and if not required, would stay with that to get away from the cost of fibre.
Also, I am a big fan of SUN and love ZFS, so if you guys know of a good solution (that is VERY robust) using SUN, I'd love to hear it.