Hello to everyone involved ins the Discussion. Allow me introduce myself, my name is Chiao formerly of Momento Mori on Frostmane EU. I was asked for my non-biased opinion on this discussion and I am going to provide it for you.
EP values that you, OP, are using:
Strength 1.1
Agility 2.02
Crit 1.86
White Hit 1.9
Spell Hit 3.17
Expertise 2.51
Haste 2.1
Armor Penetration 1.61
These are courtesy of Elitist Jerks, as crafted for patch 3.3.5 (ICC) for assassination rogues. Why post what you already stated? Because the values are true only while having above a certain gear score / item level. As you can see Haste is valued higher than Agility / Attack Power. That is not random. The exact moment when that becomes relevant is when you are able to sit on approximately 4.1k Attack Power without any buffs. Until then Attack Power has a monumentally higher value to it, compared to other secondary stats such as Crit / Haste. With both BiS lists mentioned above you will be able to sit on no more than 3.8k attack power.
So @Capii: The reason you see the dps increase is mainly because of that. As mentioned that will of course change once you hit the 4.1k Attack Power. Once you do, the 84 Crit + 21 Haste will be more valuable than 73 Attack Power. I wish I could be more helpful with the EP values before the Attack Power thresholds, but at least you have an explanation.
@Paragon rogues: I would not mock the use of
http://wotlk.openwow.com/item=37642. As the first rule of theorycrafting before any values is to cap your melee essentials without the use of gems / enchants if at all possible. All within a reasonable margin of course, but that ring is not nearly as bad as you think it is.
I hope I manged to stay as neutral as possible. But I am a betting man, and granted you're all on the same gear level at some stage - my money would be on Capii. No hard feelings.