All
Captchas are a pain I agree. Try the Invisible Captcha though - it just
requires JS and generates an id and value of a hidden field. I have this on
two sites and it seems to work OK but doesn't require the user to enter
anything at all.
Other than that, I also use Bad Behavior although recently this caused a
problem with GoDaddy's check-domains web analyser so I replace that with
WordFence which is quite comprehensive and recommended by a number of
bloggers.
HTH
>cha/ ...not specific to WP plugins
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Best wishes
John Logsdon