On wah, I have a dunlop crybaby, and a morley 'bad horsie'... both are excellent. The morley has a more modern voicing, but is easier to use as it's 'auto-off'... I probably use the morley more... But I use both a fair bit, sometimes together. If you want a classic wah, go with the crybaby.... if you want to sound like Vai, get the morley. If you can, get both - I think you'll be very happy.
Those would be my suggestions....
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