The Crybaby 535Q is pretty versatile and not that expensive...it covers a lot of wah tones. I like it the most out of the Crybaby line.
I also have a Ernie Ball Wah that was/is a great surprise...it doesn't get too weird tonally at the outer hi/low limits and it records very well. I've used it a couple of times instead of the 535Q. Also not that expensive.