Gene, how good are the NBs? I am looking at a Flex but I have a fair bit of QRM similar in type to plasma TV. My Icom 7000 does a good job of clearing it up so I can hear weaker signals under its level but my Kenwood TS590 isn't as good as the Icom in this respect.
I am not Gene but I will respond anyway because I don't think Gene has a Flex radio anymore.
I find that the performance of the noise blanker depends a lot on the type of noise. As I said earlier, it works really well on some kinds of noise and not so well on others.
It provides about 20dB of suppression of the power-line noise I have at one QTH. I have a noisy light dimmer in my house and it only provides about 10dB of suppression of that noise source. I can't comment on a plasma TV as I don't have one and there doesn't seem to be one nearby. We have an LCD TV at our school and the noise blanker seems to have no effect on that, I suspect because that TV is radiating low-level broadband hash rather than a high peak-to-average ratio pulse.
I hope you don't feel like this is too much of an ambiguous answer.
73 de Brian, WB6RQN/J79BPL