Valyrian gets you 100 rep with house targaryen

Nobody else gets anything directly, but you can manually add the Sand Snakes and Giants to your party with the save editor, so don't worry about that. I traditionally play the Reach, why? Because they have a tier 2 Cavalry unit and a correspondingly tough Tier 3 Cavalry. Why does this matter? Cavalry get a 30% bonus in AutoCalc battles. This is how I beat the Others. I stash several thousand of this in the Free Folk towns, and then I put them on Patrol when the White Walkers spawn. Since they are Cavalry they move very fast and can catch them. A few thousand in a patrol will wipe out the White Walkers in autocalc.

The only way to ensure you have enough of them, is if you play a Reachman. So, since you can add the Sand Snakes and Giants to your party anyway, a Direwolf is not worth just autocalcing the end game nuisance. You say, why not just turn it off then? Well, it is still a challenge to get that many to the North and ready to fight the Others. If you play legit you just gank them with Obsidian troops anyway.