Wah pedal is the best..

I never was a big fan of the wah, but my guitar teacher taught me to do it rhythmic and not necessarily on certain notes. Like.. wah 2..3..4.. wah..2..3..4 or 5..7 depending on whatever beat's going on :P Personally I've only used auto wah for live concert and it sounds cool but not impressive. I prefer delay effects and phasers.