Silver Pyromancer from FoE (IIRC) may be able to help you on that, and what is the DMM for?
Probably Searing Spell, which costs 2 turns/use, so would give him about 5ish Searing Spells per day. That's ok, I suppose. Silver Pyromancer would indeed be nice, but it loses a caster level, and iirc it's only half the damage becomes holy, making Searing Spell, if you make it good, more valuable. I think it gives you access to pally spells, though, for what that's worth. Although I cannot recall what book the S Pyromancer is in off hand.
Doesn't Blackfire, despite its name, not do fire damage? That could give you a great fallback in addition to Searing Spell. My only problem w/ this build is that if you're going to focus on blasting it'd be good to blast really well. I'm a little at a loss of how to do that off the top of my head. Even some +1 per die of damage stuff could help out a lot. I feel the Elemental Savant doesn't really give you anything along those lines. It gives you some resistances, but no more oomph to the blasting.
You might also ask the DM if you can have the fiery equivalent of Lord of Uttercold.