Ultimately the difference between DW and 2H in terms of dps are very similar so it really doesn't matter, DW tends to be slightly ahead since it provides 40% more swing dmg as apose to 40% wep speed that 2h provides.
All that you need to worry about is picking the best ilvl weapon you have in your bags, blizzards done this on purpose so you don't need to worry about which weapon to use, just use the best you have currently.
---------- Post added 2012-10-23 at 02:38 PM ----------
To the OP,
This is my PVP Spec, taking advantage of any talents & glyphs that provide the best advantage in a pvp situation, hope this helps mate
http://www.wowdb.com/talent-calculat...bVdaVdUVdcA/nr
I'd just like to point out, these talents are based on my personal preference while considering the OP's purpose.