Need info regarding 4 classes post BB.

to continue my line of inquiry, I'm wondering what weapon would be optimal for a Drk , Sky Skis , Bellum Spear , VIP spear or Crimson Arcglaive ?
the reason I put bellum there is because it has crit if that stacks with dragon wisdom then I think its worth considering.

Edit : Also , since my dk is 107 and i'll have all the key skills maxed, what would help me level to 120 faster - max Sac or Max roar first?

Keep in mind Bellum Spear is a durability item, so you have to use tablets to upgrade it. Since Spears and Polearms offer the same attack power, you'd always want to aim for the faster of the two first and then attack. Since you're throwing VIP into the mix, VIP items can get higher potential than any of the others listed. Both Arcglaive and Sky Skies are normal speed, so since Arcglaive has higher base attack, you could always go with that for a cheaper alternative to VIP weapons (remember the DEX requirement). Should you pick VIP, the spear is faster than the polearm.

On your second question, Roar has a cooldown. Just keep that in mind. I would say you wouldn't have to worry about either. Sacrifice is for bossing mainly because of the high PDRate bosses have (it ignores it). You're better off worrying about your weapon and using Crusher/Fury.