With those stats, and considering your party could use another frontliner, a cool possibility for you would be the dragon disciple prestige class. They make great "blasty casters," also get things like natural armor, and multiple natural attacks-- so they can frontline too! Eventually even dragon form and breath weapons. Do you expect to play this character into the teen levels? Because otherwise this is not worth considering. It is painfully slow in the beginning, but rich in awesome at mid-levels and beyond.
If you go either straight sorcerer or dragon disciple, consult the excellent guides that are stickied at the top of the Advice Board.
For your original question-- Fire Elemental is slightly better than the Ifrit bloodline in my opinion. Eventually look into metamagic feats that convert your fire spells into another elemental type to give you flexibility.
If you are considering the Dragon Disciple, then take a look at the Suli as well. They are also an elemental blasty type. They don't get the favored class bonuses. But they do get an extra d6 of elemental damage on natural attacks. So if you're doing a claw/claw/bite-- you'd get to add an extra d6 damage to each attack.
Also for DD I would go cross-blooded sorcerer. Take a dragon type with a different energy type-- and then you can convert the energy types at will. The other reason for going cross-blooded is that the dragon disciple class will stack with your sorcerer levels and let you progress in them. Yay! Because you're cross blooded, you will progress sllloooowwwly at first. So really don't do it unless you're sure of reaching mid levels. But then you will rock.
At low levels you'll have elemental ray, and burning hands for offensive. I'd then pick up mage armor for a bit of defense. Then vanish and old reliable magic missile, for the tough to hit.
For DD there is no combat style but natural attacks that are worth it for you. Fight with claws and bites, not daggers, and you'll get multiple attacks without spending feats. There's more as you progress, but them's the basics to get started.
I've done it. But I can't recommend cross-blooded sorcerer unless you have something very specific as a goal (aka dragon disciple).
Sorcerers are already 1 level behind wizards in spell-progression. With cross-blooded you'll be 2 levels behind wizards. And you'll know one less spell per level. Very painful.
I went cross-blooded because I liked being able to switch energy types back and forth. Then I realized there was a metamagic feat that achieves the same thing without sacrificing so much. Too late.
Since there are many permutations, its probably easier to start with knowing what you'd like to be able to do.
Blast?
Summon things?
Enchant?
Buff?
Have a familiar?
Switch hit, and be able to fight?
Once we know what you're going for, it'll be easier to advise. And again, I highly recommend the sorcerer's guide at the top of the advice boards.