I do a lot of work in D|S and Carrara and I can tell you first hand there are a lot of really good resource sites out there for them.
If you use D|S, Carrara or Poser you'll want to sign up for the DAZ3D news letter.
Every month they give you a link were you can download a free fully rigged mesh. Like any thing else some are better than others but they're all still well worth the price.
