It sounds like you're a little un sure. When it comes to experimenting with effects, the cheapest way to go is multi-effects.
If you're not sure if you want an auto-wah or a pedal wah, then something like a used B2.1U would help you find out what you're craving for a lot less than buying two decent single pedals.
Also, multi-effects seem to be getting better and better. The new Line6 stuff looks great, although i've not had the chance to try yet.