Searching for a network-attached storage?

I'm searching for a NAS (network-attached storage) that has the ability to share its files with iPhone, Macs and Windows PC. I was thinking of 4TB of storage. This for example: http://www.synology.com/products/product.php?product_name=DS112j. Any other products?

Since you have to add disks to that one as well, you can use any spare PC and built your own NAS with "FreeNAS". Almost the same amount of work…
http://www.freenas.org/

Either way, you have to administer either the Synology or PC, regardless. Both are probably based on some form of Linux or BSD. With a PC build, you can add whatever hardware you want…

Look into it, it can do all the Mac stuff as well… Including iTunes, media server, torrents, etc.