I thought about buying only one stick of 8gb ram and in the future buying another as I needed. But I read somewhere that people have problems getting RAM to work together when doing it this way. If I recall correctly, it is buggy even if you purchase from the same memory maker.
BTW, I did want to build the system with Arch, or Fedora but I love how SteamOS works and will be sticking it for the time being. The current desktop setup I have is standard Gnome. Which I kind of like.
I think it is great, but I have a history with Linux that spans more than a decade. If you know how to do it, you can turn SteamOS into a full Debian system by adding a few repositories and you can then load so much software on it. The SteamOS part still runs.
Also, I put Netflix, Youtube, Hulu, MLB, and other websites in my Library originally, they appeared in the Steam Libary and would launch a Webapp for the individual site I wanted. I added my SSD and haven't got around to reinstalling them again. But while in BPM, you can always go to the webpages directly without having them launch.
Finally, I plan on adding a Plex server to this system. It will be my HTPC that has everything in BPM.
Mainly, ARK Survival Evolved and all Valve games. In ARK, I play with a huge tribe and can go to areas that would crash many computers. I own 55 games and only 3 are windows only and they run beautifully in WINE (Batman Arkham City, The Witcher 1, the original Left4Dead)
Recent additions that I playing on this system:
Warhammer 40,000: Dawn of War III (looks amazing) ,
Torchlight II ,
Shadow of Mordor
I plan on having a Plex server running in the background, that would require a minimum of 2gb ram. I also plan on dedicating a few gigabytes of ram to a multi-seat boot on this computer. One monitor would load up the Steam system (GPU), the other would load up Gnome (motherboard). This requires dedicating some ram to the CPU onboard graphics. I purchased the 16gb of ram for $101 and felt that it would serve me better because I will use this computer for other things than gaming.