Without Improved Slam, it seems like hitting MS, WW, and then Slam would be the best option. Slam over and over is high DPS, but I'd rather have 2 instances in 2 seconds that don't affect white swings rather than a 2 second cast ability that literally stops your weapon swing and prevents you from doing instants. Of course, we've tried Vael once, so I might be completely wrong.
BTW: I got Sulfuras about 2 hours ago. YAY!!!!!!!!!!!!!!!!!!!!!!!! I'll post some SS's later!