Levinson vs. McIntosh vs. Lexicon or ?

I believe from my own experirence that Mac amps (with autoformers) mate well with most speakers.They are also smooth and powerful sounding, and each of those speakers that you mention are high resolution designs that could sound bright with the wrong amp.

I can tell you that the Mac sounds better than the Lexicon.
The service from Harmon international companies does not hold a candle to Mac service.

Levinson Wanted over $ 1200.00 to fix a transport. (Analogique in NYC charged $ 685.00)

Lexicon will not release skimatics to any repair shop and wanted a fortune to fix an MC12 processor

The Mac 136 processor is excellent and sounds great in Stereo too.

Mac fixes all gear at very fair prices, and promptly too.

I do not consider Lexicon amp to be in the same league as a ML amp (I do agree with the Harmon support and service mentioned above). I am not crazy about McIntosh with Wilson, but otherwise I generally like Mc. I do like Wilson speakers (that is what I run). Of the three amps listed by OP, I would go with a Levinson .5 series or better.