I owned the 75se and the 150se. I can't exactly put it in words but, I much preferred the 150se. I would go with the 150se and bi-wire.
Bat vk75se
There seems to be a few good deals on these amps right now. Im looking for amplification on my B&W 800N, questions are vertical bi-amp with a pair or just convert to 150se, more important regardless of configuration will they have the balls to drive the 800's? Pre will be vk51se, mbl digital, and au24's all around. Thanks, John