MY ideal version of a Dragon.

[img]tongue.gif[/img]
Immunity to level 1-5 spells. Hell, if a Transmuter can be immuned to level 1-7 spells, and Liches can be immuned to level 1-5, this should be alright for Dragons too.
Base 75% to all Magic, Magic Damage and Elemental Resistances
Assuming a Red Dragon, 127% Fire Resistance. Edit as necessary for other types of Dragons.
Dragon Stomp:
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The Dragon slams its' foot onto the ground, creating a shockwave around the Dragon. Any creature within a 30' radius of the Dragon must save vs breath or be stunned for 2d2 rounds. Creature is stunned for 1d2 rounds if save is successful.
Wing Slice:
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More precise than a Wing Buffet, this enables the Dragon to target one target with its' wing. The target must save vs breath or suffer 4d8 slashing damage. Target suffers 2d8 damage with a successful save.
Wing Slice also has a 10% chance to score a vorpal hit. Target may save vs death to prevent the vorpal hit.
Dragon Squash:
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Dragon may use its' foot to attempt to squash any melee combatant. Target must save vs breath with a -2 penalty or suffer instant death. A successful save negates the attack.
Default Attack:
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2d4 slashing damage + 2d4 crushing damage, excluding STR bonuses
Immunity to Time Stop, Fear, Confusion, Charm, Hold and Stun:
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I am pretty sure I have more to add, but this is something I would like to see.