Just to clarify then, are you transcoding as well to downconvert these larger files to mp4s in your setup? Don't get me wrong, I definitely like what your doing, but Plex is free to use inside the home already and doesn't need a powerful endpoint or even server if you are not transcoding. Just trying to figure out the gaps you are filling compared to them.
No I am down converting them using handbrake.
I haven't fully looked into all the features of Plex but I am just putting another option out on the table for people to use.
I do have to say this is also a sub part of another project I am working on. So in reality I am just killing 2 birds with one stone. <-Figure of speech.