How much storage does this amount to? A hell of a lot, if you like. Cram a couple of 500GB drives internally and put them in RAID 1, or if you're feeling dangerous why not go for RAID and have yourself 1TB of storage on your little NAS box? Add another 500GB drive externally and you've got yourself ample storage for photos, music and videos - providing there are no rootkits on your PC stopping you, of course.
http://www.hexus.net/content/item.php?item=4229