Dunlop Wah's are good, Vox wah's are good....Basically, either get a Vox or a Dunlop, you can't really go wrong with either. With most Wah-Wah pedals, you can't distinguish a difference in the wah (Envelope filters, on the other hand.....totally), or at least, can't distinguish it to an insane levels. Yeah, they have wah's that are 'far-out' or 'extreme', but your standard wah pedal is not a very complicated machine!

Best of luck.