That might be OK if you choose to buy a dedicated RAID controller card. Why? Because then you aren't tied to a specific motherboard RAID implementation. You have a chance of keeping your data if your motherboard goes bye-bye. Since this is a business be sure you have a bullet proof backup strategy. RAID is not a substitute for backups.
given all you said, are these drives good enough for RAID?
And how about the HDD for gaming?