|Software and faux or fake raid are poor choices. Only a real hardware raid controller is fast and reliable to most enterprise level users. You should consider a good quality hardware raid card. They will provide all that a quality raid requires from backup to failover and support.|
I'd get a good firewall or security appliance or a virtual or dedicated software solution. Many free ones exist but none will compare speed wise to a hardware device.
1/3 of highway deaths are caused by drunks. The rest are by people who can't drive any better than a drunk.