If you go with pressure treated, expect it to last about 12-15 years. Around my area, it's about $30/foot installed. Actual material cost is about $10/ft.
PVC, there are so many different brands to even look at. Personally, since I've installed a lot of fences, Tuf-Fence, is THE best vinyl fence I have found. Looks nice, and is SOLID in comparison to a lot of the **** that's out there. Ease of putting it together and taking it apart is what I find makes it stand out from the rest.
This stuff is around $50/ft NOT installed, but worth every penny.
Make sure you ask which product they are quoting you on, as it makes a huge difference.