Considering the buffs to Frost Strike, Howling Blast and Blood Runes becoming Death Runes permanently in Frost spec, do any of you have any theorycrafting to decide between haste and mastery for 2h Frost DK?

I changed between mastery and haste several times now and atm I find haste better in Arena. The reason is because the more hits I can get in while the target is melee range the better. Usually a smart target will not stay in melee range more than 2-3 seconds. With mastery and especially if you stay in Frost Presence, you get one hit or two, and by the 3rd second your target is out of range.

So what do you guys think? Haste or mastery in 4.1?