Raid advice : one raid5 or two raid1 on small fileserver

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http://serverfault.com – i recently start working in a new (small) company having an "old" file server with windows server 2003 and an hw raid 5 with four disks. Last week the server is dead. We decided to build up a newer system with windows server 2008 using a PC with this hardware : CPU: Core i3 3,2 GHz RAM: 2GB Motherboard supports Raid. (we can't use the hw controller from the first server) Examining the disk configuration i not sure about which one could be better for us between a Radi 5 with 4 disks (as in the past) for OS and Data, or two distinct Raid 1 (one for the OS and one for the Data). We have about (HowTos)