If I can, then I disallow hundreds of pages that are duplicate content and should not be crawled.

If I don't then I send link juice to urls that I don't want seen.

This is a good answer though, thanks. Any other thoughts?

I have been disallowing /*? So I know that works without affecting crawling. I am wondering if I can disallow the faceted nav urls.

So disallow: /category.html/? /category2.html/? /category3.html/*?

To prevent the price faceted url from being cached:

/category.html?price=1%2C1000
and
/category.html?price=1%2C1000&product_material=88

Thanks!