I feel that Ninja Scroll was a descent dub. Though I've never seen the Japaneese version, I feel that they didn't hide anything as in the way of language.
I bought episodes 1-25 on VCD from a guy on e-bay for $20. For those you just have to know where to look. Also if you go to Kazaa.com they have a program that you can download the episodes that way. That is how i was introduced to it.