I just thought about the second list again, because it would be by far the cheapest to build i think.
If i were to take the gamble and actually field a Greywater Batallion, i'd go with:
1x Cogsmith (60)
3x10 Ironbreakers (330)
3x Helstorm Rocket Battery (390)
Greywater Battalion (120)
which would leave 100 points open.
If i were to go that route, would you recommend a Warden King or a Runelord with the remaining points?
I think having the Warden King as an additional fighter would be important with only 30 frontline troops, but the Runelords ability to dispel also seems pretty important to me.
Just a theoretical question tho, i'll probably go with the first or third army anyway. Being completely new i just cant really tell how important dispelling would be, if i had to decide between the ability and combat stats.
Especially at 1000 points i have no idea how much magic i actually have to expect.