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Pretty much the 18's as anything else you wouldn't be able to reduce the tire profile low enough to compensate for the added diameter. A 21" in the front WILL raise the bike. Not a huge amount, but definitely noticeable. Besides, the 18's would probably look the classiest on your Ultra anyway.
Also, if you want to go with a reasonably priced option, believe it or not, check out a couple of the HD options. Might give you decent price break when all is said and done.
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