Rezzers are generally avoided for intro games (they are a bit complicated and need extra models). The book 2 masters are all a little on the complex side compared to book 1 so I'd avoid them as well. I'd say go with either the Viktorias or Perdita. Both boxes are fun for new players on account of all the models being unique characters, Viks have some complexity from their dual master role but are otherwise a straightforward close combat battlegroup, Perdita is a nice simple but strong set. The reason for avoiding Sonia is that she is such a counter to Rasputinas play style in a beginner game, Pandora adds all the complexity of morale duels, Zoraida has all sorts of strange stuff going on and Lilith would require a few extra models.