So here are some preliminary results:
Raw Priest Power, no Talents:Smite Spam: 700
dps. (Not bad, not great either)
Smite Spam with Holy Fire: 960
dps. In this run, Holy Fire accounted for 30% of my
dps (of which only 5% was the
DoT),
despite being cast only once every 10 seconds. What that implies is that casting holy fire results in a drop in smite DPS of around 60, but results in a massive overall 37% damage boost.
Raw Shadow Word Pain: 225
dpsRaw Shadow Word: Pain + Devouring Plague: 450
dpsWhat's interesting here is that Shadow Word: Pain and Devouring Plague are basically even in terms of DPS.
Finally,
Shadowfiend damage: 570
dps. Clearly, for the 15 seconds or so the
Shadowfiend is up, he contributes a fairly substantial damage boost.
Talented:Spite Spam only: 1175
dps. That's pretty nice for spamming a basic nuke, and 2/3 again better than untalented! Surge of Light is a pretty
RNG (random) ability, its nice when it
procs, but will only do so about 20% of the time. If adding Holy Fire to the rotation leads to a ~35% damage boost, that would suggest we're heading for the range of 1600
dps.
Spite Spam with Holy Fire: Maximum of 1400
dps (average result a bit lower, around 1300). Definitely better, but not as good as I had hoped. Holy Fire once again counted for about 30% of my damage, but in practice that meant a disproportionate ~170-200
dps drop in
Smite's damage and only 20% more damage overall. Clearly, interfering with the sheer throughput of Smite is going to give any and all attempts to increase
dps decreasing returns. That is, the more complicated the rotation, the more
Smite's damage is going to suffer.
Note: These tests were conducted without
Glyph of Smite, which I am finding hard to come by on the
PTR without heading into the lag-fest that is
Dalaran. Some back-of-the-envelope calculations suggest that the Glyph is worth ~200
dps, taking our final result to a respectable 1600
dps.
Talented, Devouring Plague + Power Word: Pain is worth about 570
dps. But again remember, Smite is doing ~1200
dps on its own. That means, over the space of 2 global
cooldowns, we lose 3600 damage. Shadow Word Pain lasts 18 seconds, so its 'effective
dps' contribution is perhaps 30% lower than this figure. Devouring Plague has a 24 second
cooldown, so is a little more efficient.
So Let's Blow Everything!My first attempt was less than ideal. Adding
Shadowfiend, Devouring Plague and Shadow Word: Pain to the rotation, as well as blowing Power Infusion,
Beserking (
Smiterella is a troll),
Living Flame and
Scale of Fates resulted in a paltry 1350
dps.
I tried replacing the 'on-use' trinkets with passive ones (
Pandora's Plea and
Eye of the Broodmother to simplify the rotation, and this time only achieved 1250
dps. In part, this is because
a) the passive trinkets are largely inferior to the 'on-use' trinkets for
dps (
ie. the passive 125 spell power from Scale of Fates is the maximum benefit on Eye of the
Broodmother);
b) Pandora's Please didn't
proc; and
c) I lacked the extra hit rating of the Living Flame.
Going back to the active trinkets, and getting in some practice improved this performance, resulting in a maximum performance of ~
1550dps (again, without Glyph of Smite). I can hit that mark fairly sustainably now; over time, enough
crits start
accruing to have a legitimate influence on the statistics. Latency also definitely plays a part, by using a timer to start casting before the previous smite has finished, I can pack
alot more
dps in.

So I'm still on the fence about this one. I'll put in some more practice, hopefully get a Glyph of Smite, and then come to a final conclusion.
Until next time . . .