Purely for fun, I parsed myself on a couple of fights in Atiiki, the place I visit most days to burn Lesson.
I pull with VP, cast PD then lay on two nectars and Vengeance, then Juju and Curse. With an AE3 potion running, I renew the DoTs at between 50 and 60%, then the mob dies before the second batch wear off. It's not the most efficient way of doing it, but it works. Bear in mind killing in 2 minute intervals is more important to me than outright DPS.
Anyway, canni-ing when I can and with a resist on Juju, I ended up just under 700 DPS. My foci are:
Affliction Efficiency 6 (can't beat up to 25% mana savings)
Burning Affliction 6 (for magic DoTs) and
Vergalid's Blood (30% poison focus)
When it comes to yellow-conning nameds in Atiiki I have to go into "DPS mode" - less canni, more DoTs.
I pull with VP, debuff with PD then swap in a disease DoT. I land 2 of the three poisons, cast the disease, swap it out for another disease, cast the 3rd poison DoT then the 2nd disease. That's then swapped out for Yoppa, I cast the two magic DoTs, then Yoppa, then renew the other poison DoTs. It sounds far more complicated than it is, really.
Anyway, that allows me to push towards 850 DPS. I'd imagine a raider with 60% foci could reach 1K DPS without too many problems, in all honesty.