It may not be relevant, but I recently picked up a 210TVX, and it's a great little cabinet. I use it along with a BX115-BW and they're a nice pair.
I had been looking for a 410TVX when this pair become available locally, so I jumped on it.
If you get the Nitro 450/410TVX, I'd be interested to hear what you think of that combination.
Best of luck.