That team comp should work great!
The user (SerScruffington) that has done the best so far in mythics, and made some youtube videos/twitch streaming used that layout except has a Monk healer instead.
The benefits of the monk are 5% more physical damage (this includes all hunter damage) with their mystic touch passive ability ,so as long as the monk hits the mob once, you'll be doing 5% more.
He has some great uses of Ring of Peace as well.

I've used both and the Resto for me felt cleaner and less focus needed. They excel when a group is stacked and that's how our style is played. (It really comes down to user preference though).
For Alliance, Sargeras is also a great choice, it's one of the more populated realms.