Aloha newtechie,

If I were going to use one of those four I would probably use SpamBayes.

You need more than oneline of defense these days. SpamBayes is good,
but I would use SpamPal and OLSpamCop as well. Anything thats get past
SpamBayes you can report to SpamCop using OLSpamCop (the outlook
SpamCop extension). SpamCop will then blacklist the spammers, and
SpamPal will use this blacklist to stop them bothering you again.