The only problem with the Elemental Savant is the fact that Knowledge: Planes is cross-class for a sorcerer. And the feat that would make it a class skill is from the Forgotten Realms so I don't think that counts.
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You never mentioned how character generation was going to be done, so I am posting a 32-point buy character.
This is an old villain I dug up. With a few minor tweaks, here he stands as a 20th level character.
Gnomish Sorcerer
STR: 14 (10 – 2 racial + 6 Item)
DEX: 20 (14 + 6 Item)
CON: 18 (16 + 2 racial)
INT: 12
WIS: 10
CHA: 32 (16 + 5 level + 5 tome + 6 Item)
Equipment:
Cloak of Charisma (+6)….36,000gp
Amulet of Natural Armor (+5)….50,000gp
Gloves of Dexterity (+6)….36,000gp
Bracers of Armor (+8)….64,000gp
Tome of Leadership and Influence….137,500gp
Robe of the Archmagi….75,000gp
Ring of Protection (+5)….50,000gp
Ring of Evasion….25,000gp
Boots of Striding and Springing….6,500gp
+5 Keen, Returning, Defending Dagger of Ghost Touch….162,302gp
Belt of Giant Strength (+6)….36,000gp
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Equipment Total: 678,302gp.
Money in Pocket: 71,698gp.
Normal AC: 29 (5 Dex + 8 Bracers + 5 Ring of Prot. + 1 Size)
Feats: [Evasion], [Spell Penetration], [Summon Familiar], Empower Spell, Heighten Spell, Improved Initiative, Weapon Finesse: Dagger, Point-Blank Shot, Precise Shot, Leadership (this will give around an 18th level cohort if it’s your last feat.)
Spells:
Level One
Charm Person
Feather Fall
Grease
Magic Missile
Shield
Level Two
Melfs Acid Arrow
Mirror Image
Alter Self
Rope Trick
See Invisibility
Level Three
Displacement
Fireball
Protection From Elements
Haste
Level Four
Dimension Door
Improved Invisibility
Dimensional Anchor
Stoneskin
Level Five
Cone of Cold
Hold Monster
Teleport
Wall of Force
Level Six
Greater Dispelling
Disintegrate
True Seeing
Level Seven
Greater Scrying
Limited Wish
Spell Turning
Level Eight
Iron Body
Mind Blank
Horrid Wilting
Level Nine
Foresight
Time Stop
Shapechange
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Remember -- whatever else you do with your character... Have fun! Sorcerers are great, especially when there is a wizard around to torment about their need to memorize spells and prepare ahead of time. Heh.
Oh, and if your DM does allow FR stuff, take the Archmage PrC. The spell list above qualifies. I'd recommend the Mastery of Shaping and Mastery of Elements in addition to the normal Spell Power +X upgrades.