So I'm contemplating a 2000 point salamanders (new detachment, vulkans detachment) army.

May or may not include Vulkan.
I own 3 Infernus squads of 10. I was thinking a couple of leaders attached to them. Cut between lieutennant, justicar and librarian.

The second unit type I am considering of getting are Flame Pistol totting Vanguards with Jump Packs. Mainly for those pistol rules and detachment abilities mixed with spending some CP on stuff in melee with them.

For the rest of the army (roughly 700pts) I have little clue what to do. Could I include some deathwatch allies perhaps? I hear they have a lot of flamer stuff. I must be missing a unit that has a lot of flamers somewhere......
I included the salamanders detachment in the images so it's easier to answer my questions.