i play deep affliction, being the top dps in my guild on patchwerk. and about 30% of my damage is from shadowbolt. But i find when going for pure spell power, you build a decent amount of haste, its crit that you lack. So it doesnt really seem to affect you so much to go for haste over spell power ever.

I am not an experienced theorycrafter, and if I pretended to be one and gave you hard numbers and told you that they were absolute, I'd be torn to pieces by people who are more familiar with the relevant math than I am.

However, since you asked me, here's my general outlook at this point:

Spellpower is always your bread and butter. More so for affliction than the other specs, but in general it is the most important.

Haste improves your global cooldown as well as your cast time--and only 2 out of the 6 spells cast during most of an affliction warlock's rotation are instant cast. (corruption doesn't count, because after the first time it shares it's re-cast with haunt) The faster you can refresh your dots, the more shadow bolts you'll be able to cast before you need to refresh them again. And that's awesome.

Crit is *most* important for destruction, but all specs benefit quite a lot from it. Modern affliction warlocks (again, before 3.1 comes out) not only get extra damage from pandemic with their crits, but Shadow Bolts are the anchor of the affliction rotation. And what's more, with the Improved Shadow Bolt talent, each SB crit currently results in a massive spellpower boost for almost all of your dots.