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I prefer we stay away from recommendations, instead have a look a the features of the scripts you find at the search engines, then feel free to ask any questions about features you are unsure of, or for opinions of those feature's relative value. Do this without getting into specific cloaking script names and brands and a good discussion will ensue. Otherwise we'll just get a couple of links listed and you won't get much dialogue or help.
We already know you can find the links at the search engines, but insight on approaches and methods of cloaking you can only find here.