is this a PvE or PvP build? because if it is PvP, i dont recommend fire storm and maybe meteor shower (never seen it before). A smart player will just run out of the AoE without taking much damage.
Yeah that's a good build for pve. My first beta character was nearly the same, although I used whatever fire damage spells I had to nuke groups with but also had the soul feast and it helped a lot. I only had time to play her up to underworld, but up to that point it usually killed as faster or faster than most stuff in pve. Fire's great for multipule enemies. I'd look into phoenix too.