Tboooe is correct and his recommendation on the Infrant (now NetGear) ReadyNAS NV+ is what I bought. Speaking of "business use", I also configured my NV+ with the more robust "enterprise" hard drives versus "consumer" models since the enterprise units have some ~1,200,000 hours MTBF (Mean Time Between Failures) versus ~800,000 hours for the consumer models. For the $100 or so it costs to upgrade to enterprise drives, it is/was a no-brainer IMO.
Again, aegis.com has the best prices for the NV+ that I found and great service (ordered on a Monday and delivered Friday the same week!). They also have a lot of experience with NAS and are one of the only sellers to perform a 48 hour test burn-in. I also paid the extra $100 to bump the NV+'s memory to 1GB, which SlimServer reportedly needs/likes.
Again, aegis.com has the best prices for the NV+ that I found and great service (ordered on a Monday and delivered Friday the same week!). They also have a lot of experience with NAS and are one of the only sellers to perform a 48 hour test burn-in. I also paid the extra $100 to bump the NV+'s memory to 1GB, which SlimServer reportedly needs/likes.