No one is listing the hypothetical best,,,but what they have I think...
In my mind and wallet, the best:
HU: Alpine 7949 w/PXA-H600,,,,awesome DAC's...!
Speaks: The next Vifa tweeter i am getting, and Peerless CSC-X midbass
amps: Planet Audio tube hybrids HVT572,,incredible
sound for the buck.
Sub: well, what else: Lambda Acoustics PB10, 12 or 15...
remember the secret is to get the most per dollar, and the most expensive sometimes are not worth that much money.