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You may be over thinking this. Your choices for 18" aren't that numerous. If you're staggering on an XI, you have one ideal choice for 18" tire sizing : 225/40R18 front and 255/35R18 rear. As long as the rim is 7.5"-8.5" front and 8.5"-9.5" rear you'll be in the correct range.
If you're not staggering, just use 225/40R18 all around with wheels that are 7.5"-8.5". The vast majority will be 8" wide.
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