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What spark plug are you guys running (in the stock head) for a 164-180cc bbk with a 11.1+:1 compression?

Currently running the optional one cooler CPR7EA-9 on the stock 125cc, but i have a bbk coming and was wondering if i should go one more notch up to CPR8EA-9?
 

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Im using a ER8EHIX. Except thats because the Koso head needs a CR/ER with its 8mm threads. (i think the first letters are the threads)

But anyway. Id go up to an 8, and even switch over to an iridium one. even if they dont work any better, that extra 7$ i spent makes me feel better. :)
Per my discussions with Brian, when I asked him about going to an 8, he suggested it himself.
 
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