first dedicated media server build

[bitmap]

A couple of things. First off, yes. You might want to consider a 2x8 setup to take advantage of dual channel RAM but what you've outlined will more than take care of the tasks you've described. Second off, why are 1080p streams being transcoded? You're 1080p media, in most cases, should be direct streamed to clients unless you have very limited upload or metered bandwidth. Both are fairly common nowadays unfortunately.

One thing I didn't consider when I did my build was that you don't need a powerhouse most of the time, so it might behoove you to consider a lighter, low-power chip for the brain. It would save you cost in the long run and you wouldn't notice a difference, particularly if you ensure your media is direct streaming most of the time, which has very little resource impact other than network load.