What 2 channel Amp would you Buy for $6k?

It is hard to give advise without knowing more about your system's needs
How efficient  are your speakers, What other components are in your current setup.
Do you require a balanced design.
Power amps can run the gamut from warm to bright in sound with small power output to very large
Matching components for synergy from the Audiogon community will be far more helpful
Dennis
 

Classe is closing its doors...may affect it resale value
McIntosh on the other hand works very well with B&W and has a steady resale value