pcl's are very limited in their use in blitz, using 2 guns will get you tired of it very soon,
km has nice ships to use in blitz all trough the line imo.
the only thing i do use PCL's for a lot if for CV escorts (but then again, a DD1 could also do that).
so imo you shouldn't invest in a PCL, but rather go for the moltke as suggested above.
imo the PCA is also better (or at least more usefull) than the PBB.