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That's some expensive stuff for externally balanced cranks.... For the same price as their top of the line, you could have on of Eagle's internally balanced kits. Click the link in my sig and look at part number #14804, or #14126 for a true 418.
I would go with a 408, not going to really see the 10 cube difference and it leaves room for a rebuild or two down the road depending how big your comfortable taking it over.