Dual Wield is the way to go.
What Dual Wield does for you:
1) Allows you to use 2 recon slots, which enables you to use a strength of battle pot and not take aggro (enabling full dps -> e.g. I'm using 2 IX's.)
2) In longer fights, using a 2h as a W/R is a painful endeavor. You will find yourself low on rage and energy most of the time (making a careful balance between both key...). Dual wield fixes this problem by allowing you to use more rage skills more often.
3) 5% extra mastery for the 1h narrows the gap between the 2 weapon sets. The 2h weapon has the capability for more burst dps, but because of aggro/rage issues (let's face it: how many people on US servers have a VN cape?), dual wield I think will result in more dps more often than not.
2 Recon's totally takes the cake tho...
Also, to say that just because you are dual wielding you can't burst is...false as well.
http://imageshack.us/photo/my-images/89/…1103011543.jpg/
Also...post patch numbers, no sigil. Crits tho? well of course.