Not only is panix competitively priced, their abuse team is top notch. They're *death* on spam, both incoming and outgoing.

There's always the option of doing your own spam filtering - I'm reading my mail in pine in a shell, and I've got procmail and the SpamBouncer (http://www.spambouncer.com) running on my incoming mail. I don't use it to report spam - just filter the mail I want into folders and throw the spam into its own folder to look at later. I see very few false positives.