If money isn't a concern to you, NVS would be a good addition to ur TNV in my opinion. Then you'd have 2 of the same core with different coverstock to take on different lanes, even the varying medium lanes that your house shot may have.
I've seen BWP, i think it reacts very closely to the TNV, so I don't see a point in getting the bwp unless u replace ur tnv right?