Reason I like Silver Pyromancer, though, is the Untyped Damage. That, and free Empower and Blind effects on blasts.
Sanctified One of Kord may be better if you can't get Turn Undead as I propose or use another base.
Wilder 6 / Paragonistic Apostle 1 / Sactified One of Kord 1 / Wilder +12 is simple and works. Though some PrC is best, of course, this does the job.