B18C6 is a Euro ITR motor with 11:1 C/R
B18C7 is also a Euro ITR motor but found in '99-01 Australian Integras
the c5 is probably going to be cheaper (thats the first Ive ever said that!) because its just easier to find. Plus not many people have even heard of the c6 and c7.
Go w/ the c5 and put in a thick headgasket if thats what you wanna do...but the c1 would be a whole lot cheaper to turbo...and the b1 even less
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