I like Moulds/Bennett. While Mason had a great year last year, I don't think of him as the guy I want as a #1 WR, the scoring potential is just not there because of the talented #2/#3 WRs in Tennessee. Mould's is the goto guy on his team and his main competition/support is coming from a rookie (Lee Evans).
Bennett and Westbrook look very similar to me this year and I would be happy with either one. These are both two of the guys who I would list under the category "Must draft handcuff" if I had to use them as a #2 back though.