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If ease of use is your primary consideration, Personal Antispam X4 comes the closest to the kind of transparency I find ideal. But SpamSieve has superior accuracy, more configurable options, wider client support, and, if I may be frank, a much higher ranking on the warm fuzzies scale. Its also cheaper and only a teensy bit less pretty. So in all, SpamSieve is my top choice. If even $30 is too much to spend, JunkMatcher is also an excellent option, but bear in mind that its future is less certain.
None of my top recommendations takes the step of reporting spammers to the authorities, and although I think thats of dubious value myself, you may feel its important. If you do, look at Em@ilCRX or Spamfire; of the two, Spamfire has at least some support for IMAP and a cleaner interface, while Em@ilCRX has a wider range of filtering options and a lower price.
Its difficult for me to recommend SpamSweep for anyone. Its not terrible, but its just too limited. Because there are much better options in the same price range, theres no compelling reason to choose SpamSweep.