Thanks a lot @aol and @sbv3000.
The ram wasn't much of an issue, I was planning to run 2x 4gb in a 4 slot mother board.If I found it to be slow I would add another 2x 4gb.
My primary concern was more for the processor.
As for the Plex, I found to be a little more "user friendly" for the wife. Although I think I would most probably end up running the native streaming service.
The search continues..