I'm using Virtual Iron with Open-E and just configured a SAN based on 7200 RPM 1TB drives. We are using 12 drives in a RAID 10 on a 12 port Areca controller. We can more than saturate a gigabit link. The biggest reason we went with that is because the array can rebuild without any downtime. And we are mirroring this to another identical SAN box offsite.