In mixed leagues, the catcher position consists of Joe Mauer, Brian McCann, and Victor Martinez at the top and a bunch of 12/60/.270 options. With this, Matt Wieters and Miguel Montero find themselves at "elite" players at the position.
In NL-Only leagues, McCann is the clear #1. From there, one can take the unsexy like Benji Molina or try for a backstop who is perceived as more sexy. Someone like the aforementioned Montero or Colorado backstop Chris Iannetta.
Either way, there doesn't appear to be much to get NL-Only teams excited about the prospect of drafting catchers.