If you want safe, secure and reliable, don't rely on the hardware. Even the best hardware can catastrophically fail. For true reliability, you need multiple copies of your data in different physical locations. I'd consider setting up an inexpensive home NAS and duplicating your data off-site either by means of media or an online backup service. that would be great but its an added cost so if this will be a pure file server then go with FreeNAS or OpenFiler. they are pretty easy to use and use very low resources. what is your budget, $650?