I just leveled a barb to 60 in anticipation for RoS and would like to start farming paragon levels on him (I have 2 billion gold currently to spend). However I'm not sure what spec is the most efficient at this - I've read through the stickies and it seems like that a build using whirlwind/sprint-run like the wind is very strong and using a skorn is strongest damage wise since rend is based off weapon damage.

Basically I'm just looking for some advice on where to start.. thanks!