I'd reccomend the Digitech EX7 Expression Factory. It has features 7 effects, two of which are wah's. The first wah is a Vox Clyde Deluxe and the second is a standard Crybaby. Here's what separates it (in my mind at least) from other wah's. You can tweak all the parameters- I mean everything. In addition to this, the pedal also functions as a wammy pedal, leslie simulator, univibe, space station, chorus pedal, and flanger. It even comes with 7 distortion options you can access via a heel switch if you need a boost for your signal. I got mine used for $125 TGP and have thoroughly enjoyed it. I especially like the Vox setting and wammy function. Lots of bang for the buck here.
I highly recommend the Wilson Wah. Just got one and it is the best Wah I have ever owned and I've owned a few. In addition, the manufacturer Kevin Wilson is very customer focused, great guy to deal with. www.wilsoneffects.com By the way I own the Rippah Q-Wah.
MSD Automagic Silver Machine. It's switchless which is awesome; I'd never go back to a Crybaby style wah. It also has three switchable frequency bands and four switchable filter bandwidths. You can also switch between Classic (wah only) and Modern (wah & dry mix) modes.