No clue about the comparing stats for AP/Crit with Armor penetration/Haste, this will have to be derived from extensive testing and then comparing AP gained/lost from the dps-differences.
One thing I do know though, is how to theory a little:
ARMOR PENETRATION
- with the way mitigation scales with armor (first 1,000 armor giving a LOT more mitigation than lets say the difference between 19,000 and 20,000) ->
- armor penetration gets better and better the more you have
- with our Faerie Fire (Feral) as a good start to this, I would say you can NEVER go wrong with Armor penetration
- small example (NOT based on numbers at level 80, since I have no clue about them): armor mitigation is calculated through formulas like
* mitigation for bosses = armor / (armor + 10,558), with 10,558 the number for a level 70 player hitting him (might be off a little but hey, it is an example!)
- bosses armor was typically something like 7,000, so the base mitigation was 7,000/(7,000+10,558)= 40%
- now armor penetration, let's say 800 (Faerie Fire might be close ;-) ): mitigation becomes 6,200/(6,200+10,558)=37%, which is an increase of unmitigated dps done by the player of (1-37%)/(1-40%)-1 = 5%!
- now more armor penetration, let's say you get another 1,600 from items for a grand total of 2,400
- mitigation becomes 4,600/(4,600+10,558)=30.3%, which is an increase of unmitigated dps done by the player of (1-30.3%)/(1-40%) = 16.2%, which is more than 3*5% (three times the armor penetration in the first example)
- the more Armor penetration, the higher this gets
- there is no linear formula between Armor penetration and AP, it depends on the formulas above, so no conversion in general possible here...
- and, since all attacks you do benefit from Armor penetration, it can be quite valuable.
HASTE
- haste influence is quite easy to estimate, once you can make the following breakdown:
* damage% from white attacks;
* damage% from special attacks;
* damage% from Omen of Clarity attacks.
- let's say you have 35%, 55%, 10% (NO clue, just an educated guess). Total is 100% damage.
- one % haste gives you
* 1% more damage from white attacks (linear scaling);
* a little bit more damage from special attacks (a little more chance on an extra combo point through Primal Fury), which is approximately 0% (non-linear scaling, estimated to be 0%);
* 1% more damage from Omen of Clarity attacks (linear scaling).
- meaning your new damage will be 35%*101% + 55%*100% + 10%*101% = 100.45% or an increase of 0.45%
- let's say your dps is 2,000 (again no clue), then this means an increase in dps of 9, or 126 AP (9*14)
- in this example 1% haste would be equal to more or less 126 AP
- this of course differs when damage breakdown is different and with extremely high crit% the 0% from extra combo points might be skewy too
- this might become VERY skewy (and even untrue) if haste has influence on other parameters too (like energy regeneration, which would be awesome), but I think at the moment it does not.
Oh well, chocolate cookies for everyone who read this post fully! /wink