Agreed with Dandu, the bonded item sucks for a sorc. Plus, you SHOULD have use magic device maxed, so an improved familiar is especially delicious for you.
Be a Human. Use the alt. favored class option for extra spells known. You're welcome.
For feats, you definitely want Dazing Spell, Persistent Spell, Quicken Spell, and Spell Perfection (something you want to often quicken). Flyby Attack can be nice for kiting in and out of range with spells, but is not necessary.
Stone Call is the first no SR damage spell I can think of, and it has a HUGE radius and range. It's also basicaly impossible to resist, as it's no-save bludgeoning damage, but because it's a spell, DR does not apply. Throw Dazing onto that and you have a nice area of effect will save or lose. I prefer sticking dazing on spells that grant reflex saves, though, as reflex usually doesn't have SoL options. Not sure if there are any no-SR reflex save damage spells, though.
Persistent Spell helps deal with saves, they roll 2d20 and take the lower. Beyond that, start 2/ 20 charisma, +6 item, all level up points to it, and perhaps find ways to lower the enemy's save bonuses.
EDIT: level 14 + orange iuon stone = CL 15. Greater Spell Penetration = +19 on the roll. For your perfected spell, it's a +23. That's manageable. You could also consider Fey bloodline. They get to reroll all SR checks. You'd just need the cloak that increases your effective sorcerer level for bloodline powers. If you still wanted the familiar, it just requires 2 feats (Skill Focus Knowledge Arcana + Eldritch Heritage).