what are the best sounding Accuphase or Luxman amps/preamps?

For example C-2450 + A48, or C-10x + M-10x etc

The best sounding components are their top-of-the-line models. :-)

I was going to say the "most expensive ones" but  @yingtonggao said it first. I would think that these companies don't screw up the pricing.

Yet, the F40 was faster than the F50, so anything can happen....