DK Dual Wield build with this EQ?

[zuke8675309]

Link to my armory (http://www.wowarmory.com/character-sheet.xml?r=Eonar&n=xaris)
Link to my wow-heroes (http://wow-heroes.com/index.php?zone=us&server=Eonar&name=xaris) (I find this easier to look at for gear)

I've been running a 2H standard frost build for a while now.

Yesterday I pugged Onyxia25 and won the roll on Burnished Quel'Serrar (http://www.wowhead.com/?item=49495). I also have a Peacekeeper Blade (http://www.wowhead.com/?item=47500). Sitting in my bank.

My questions: what do would I gain by going to a dual-wield build for tanking with these weapons? What would I lose over my current setup? What adjustments would I need to make in gemming hit/expertise? Which would I wield mainhand / offhand and how should they be runeforged?

Thanks for the comments!

[ghromorth]

well not yet, when 3.3 comes out with your gear you would be ready, but for now you wont be able to cap def. those weapons are perfect to DW, quel serrar proc is pretty good and peacekeeper will boost your def. But now you ahve 540 def just capped, so you'll have to change gems.. a lot of em.