Frost DK pvp: Dual W or 2H?

[Prega]

hello
need some "help".
When started pvp with this grp i did choice to go for Dual Wield.
now considering :
- the incoming nerf (ptr) about Hblast spamming (dmg reduction on secondary targets around 40%)
- the change (ptr) about 2H oriented talent Might of the Frozen Wastes (it will give + 2H dmg too)
- my personal data mining about Obliterate 2H>Obliterate DW
- the simple fact a 2H weapon is usable for Tanking and will be unique viable weapon (ptr) for Unholy

my question is ...all considered... is still best choice my original idea to play DW or it s better save Conquest pts for 2H?
Atm i have over 3000 pts in my 5 dks, i have already main h weapon 1h epic from pvp.
Wait some day and convert all to 2H or stay DW, buying offhand?

this is the situation on one of my dk, all have basically same gear, minimal differences in gems/enchants/reforge only:
mammarossa: http://eu.battle.net/wow/en/characte...marossa/simple

honestly, I m tempted, strongly, to go for 2H.
Any suggestion is appreciated