Networking & wireless forum: What Home Server is right for me?

Okay, I have an interesting series questions. Over 2 years ago, I received a HP Mediasmart 485 has a home server for storing movies, photos, music and data we could access on our PS3, computers, Android and iPad tablets and phones. I have come to the point, with the canceling of the support for this server and soon purchasing new computers for the kids and myself, where I need to upgrade my server as well. I have tried to find information on the web, cnet, computer mags, and other resources and I cannot find anything that can help me make an informed decision. I am pretty knowledgeable of computers, but when it comes down to a home server I am a bit out of my league. I feel like I need to go back to school to understand what each of these new servers do. I don't need a camera storage system, or have access to it via the internet. I just need it to work with the movies I have currently on my server, to work with my PS3 so my kids can watch them, to be a home iTunes server for all of our music, a place to store our photos, and keep software backups for each of our computers. I currently have about 4TB of storage on my server, and that's only with 3 drives in the bays (it can hold up to 4 drives at 2TB each, but it recognizes the drives as physical space for 8TB total). So I need at least 8TB but more would be great. I don't have the server set up for computer backups because I'm not sure it could handle the strain! Either way, it would be nice to have a backup for our systems since we have had a few scares! So where do I start? What do I need? What features do I need to look for? If I can swap out hard drives for specific data storage for computer backups and have drives for media, is that a good idea? So I need a crash course in a home server! Any suggestions on where to start?