The feat is Spell Girding from MoF (+2 bonus on DC vs. dispel checks made against your spells).
And I agree, if you want to play a Summoner, talk your DM into some improvements to the Summon Monster series, spell research and such.
Along the line of suggestions to give Specialist wizards something unique to their school (Disguise, Bluff as class skill for Illusionists and some such, similar to the varieties of Psions), you could try to ask for the benefit of the Summoning prestige domain.
Double caster level for Summon Monster spells, giving better range, duration and protection vs. dispelling. It is not considered very powerful for the inherent weakness of Outsiders and Summoning in general.
And I agree, if you want to play a Summoner, talk your DM into some improvements to the Summon Monster series, spell research and such.
Along the line of suggestions to give Specialist wizards something unique to their school (Disguise, Bluff as class skill for Illusionists and some such, similar to the varieties of Psions), you could try to ask for the benefit of the Summoning prestige domain.
Double caster level for Summon Monster spells, giving better range, duration and protection vs. dispelling. It is not considered very powerful for the inherent weakness of Outsiders and Summoning in general.