In your post, you recommend that Vanir's Righ Fist would be the best choice (except from Season3 Weapon) for main hand. After we got the new badge vendor on our realm, I switched from my old combination (rising Tide / Syphon) to Vanir's / Syphon. As expected, I mentioned an increase of DPS.
I used Yo's simulator (Crazy Shaman's DPS Calculator) to proof my new combination of weapons. The result was around 1380 DPS (6200 boss armor). I changed the setup to "dual syphon" (replaced Vanir's stats by Syphon stats). Against my expectations, the DPS result was higher (1460 DPS).
I don't know, how the simulator works and how reliable it is... do you think that Syphon/Syphon could be still the best combination for me?