Lilac acquired the [Belt of Blasting] AKA crafted Uberbelt of OMGWTFPWNU 
Pre 2.4 I was dreading the price for the Nether Vortices.
Post 2.4 getting the 15 Primal Fires turned out to be the hardest part… made much easier when I borrowed them from guildies 
According to MaxDPS.com the -only- dps upgrade for this is the [Belt of the Malefic] which is the T6 warlock belt dropped by Brutallus in the Sunwell 25-man.
Booya!
Maxdps.com speaks the truth. You’ll be using that belt for a veeeery long time. Congrats! XD