I don't think you can have metamgic spells as innate spells. For one thing, an innate spell is a spell like ability, not a spell. Spell like abilities can'e benefit from metamagics. It's really up to you, as DM to decide, of course. If I did allow innate spells to include metamagics (I probably wouldn't, but just theoretically), I would impose some restrictions:
1) You must have both the spell and metamgic in question.
2) You must go by the normal level of the spell + metamagic. Improved metamagic is cheap enough as is, combining it with innate spell is utterly ridiculous! Also for game balance reasons, why should someone who got innate spell earlier had to pay more than someone who had the improved metamagic? I realize that epic chracters are supposed to be "epic", but that's what innate spell is in the first place!
3) I would NEVER allow Miracle to be an innate spell, enough said! Wish is ok because it costs exp every time you cast it, whereas Miracle gives you free duplication of spells! Just imagine! Someone gets Miracle as an innate spell and can then cast ANY spell or psionic power of up to 7th level and any cleric spell of up to 8th level, AT WILL! (not to mention they would all be hightened to 9th level for free)! YUCK! Besides, no diety would grant that, they'd get a little tired of the Cleric constantly besieging his power.
1) You must have both the spell and metamgic in question.
2) You must go by the normal level of the spell + metamagic. Improved metamagic is cheap enough as is, combining it with innate spell is utterly ridiculous! Also for game balance reasons, why should someone who got innate spell earlier had to pay more than someone who had the improved metamagic? I realize that epic chracters are supposed to be "epic", but that's what innate spell is in the first place!
3) I would NEVER allow Miracle to be an innate spell, enough said! Wish is ok because it costs exp every time you cast it, whereas Miracle gives you free duplication of spells! Just imagine! Someone gets Miracle as an innate spell and can then cast ANY spell or psionic power of up to 7th level and any cleric spell of up to 8th level, AT WILL! (not to mention they would all be hightened to 9th level for free)! YUCK! Besides, no diety would grant that, they'd get a little tired of the Cleric constantly besieging his power.