Actually, there IS a way to get Quicken Spell before Rapid Metamagic, however it is non-core. PhB II variant, loose the Familiar to cast spontaneous metamagic without spending extra time, however you can only do it 1+Int Mod number of times per day. This at least qualifies you for Quicken earlier
Another metamagic feat in the SRD you may want is Repeat Spell.
For a +3 SL, you get to have the same spell cast again the next round for free. It's like a delayed-blast quicken, only without eating another spell slot for the repeated spell. Very handy for laying down covering fire and battlefield control spells en masse.
Still Spell really isn't that valuable to you. Dimension Door/Teleport doesn't have any somatic components, which gets you out of any situation where you would want to cast a spell Stilled. It is primarily useful to Gish builds who want to cast spells in full plate.
Also, Mage Armor is obsolete. +1 Twilight Mithral Chain Shirt costs 5k and gives a +5 armor bonus to AC, all day long, without any Arcane Spell Failure Chance. Grab Shield instead. Even better, grab Shield if you want to Persist it. Flat immunity to any and all Magic Missiles for all day long, and the +4 Shield bonus to AC doesn't hurt either.