Thanks Rathan, and thanks to everyone else who has been so helpful! Now, however i think i need a ruling by Jemal before i can select my High Arcana feats. Check this out:
Mastery of Elements
The archmage can alter an arcane spell when cast so that it utilizes a different element from the one it normally uses. This ability can only alter a spell with the acid, cold, fire, electricity, or sonic descriptor. The spell’s casting time is unaffected. The caster decides whether to alter the spell’s energy type and chooses the new energy type when he begins casting. This ability costs one 8th-level spell slot.
This High Arcana makes the Energy Substitution feat useless (but it still is a prerequisite for Elemental Savant so i must keep it). Furthermore it completely removes the disadvantage of being an Elemental Savant who's spells are all of the Fire type unless they are Energy Admixtured. If i can use this High Arcana to change energy subtypes on the go, i will basically never have the problem of facing immune monsters, and thus can drop Searing Spell (as it makes the spell use 1 level slot higher)
Also, can anyone advise me on how to get some sort of resist for all the elements? Or at least for Cold? I am using both ring slots fyi.
Oh and Jemal, how can one obtain a Staff of the Magi?