Yup nuker refers to a fire ele who can drop meteor/meteor shower. A good idea would be to Echo your nuke spell.
Personally my build runs a standard of the following :
1. Flare
2. Fireball
3. Immolate
4. Meteor Shower
5. Rodgorts Invocation (rather steer clear of Mark of Rodgort)
6. Fire Attunement
7. Ele Attunement
8. Arcane Echo
You can adapt as you see fit. I vary my nukes by either echo'ing MS or RI. so I would go 8,5,4,5,2 then you just spam flare till you can cast your high damage spells again. You can change the order to 8,4,5,4 but it seems that the rapid use of MS now causes some mobs to scatter. Which is why I changed to RI instead.
I am running both Attunements simply to ensure that I have energy for the high costs. This does make you a bit more of a burden on the Monks if you take damage. But if the tanks are doing their job well and you learn how to use your aggro properly, this should not be a big problem for you. If you do want some healing, swap an attunement for AoR.
One other variation would be to take Renewal instead of Arcane Echo and AoR instead of Ele Attunement. This will give you faster recharge on your echo spell (and Renewal is not easy to interupt) as well as provide healing. The downside is that you will run out of energy very fast if you nuke too much.
Lastly, don't underestimate flare. With its fast recharge and cast rate you can really spam this one and it does help a lot on enemies with health below 40% if you combine it with immolate. The warrior attacking the same target will thank you