Looks like a decent server for shared/reseller packages, sure. with the drives and RAID, CPanel, server should be between $150 to $200/mo I would think, depending on the provider. Full management would raise the cost.
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Slightly off subject, but I'd recommend against RAID 5 in this situation. Those are 1 TB SATA's which take a while to rebuild after a failure. The current setup has a higher chance of failing/losing data. I would use the 4 drives in a RAID 10 and host the backups elsewhere. In the long run, you'll have more protection that way.
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