Casting on the Defence / Combat Casting question

[Infiniti2000]

Combat casting is worse than toughness by the core rules.* At least the HP are still usable at mid levels, but one your organic concentration hits +14 you auto pass all cast defensivly checks.

Perhaps I don't know what "organic concentration" is, but +14 certainly does not guarantee defensive casting for spells above 0th level.

 

[Mistwell]

I actually think Extraordinary Concentration is a better deal than either combat casting or skill focus: concentration. It lets you take 10 your concentration checks. Elmininating the variabilty of your checks is very valuable.

Beyond that, a magic item that grants a +5 bonus on concentration checks is relatively inexpensive.