Suggestion for a home file/backup server setup.

Hi,

I am trying to setup a home server which has 2 purposes.

1. Daily backup my 2 companies essential files.
2. Act as a file server for my own home usage. Storing files and probably streaming videos from this server if possible.

I am thinking to put a 8 port RAID card in this server. 4 SATA drives in RAID 10 for home usage, and 4 SATA drives in RAID 10 for business backup. The home section RAID 10 may be over kill but there are some valuable photos and videos of my child and family which I like to have a good protection for.

I am not sure if I should purchase real server specification components (CPU/RAM/Mother board/HDD) or put in a more budget kind of components. I want to keep the cost down but if it requires server grade then I will go for it.

Also, which RAID card do you guys suggest? I've been eyeing on adaptec and LSI.

Thanks in advance for your suggestions!