Speakers dont determine airiness as a rule. It's mostly the source. If you want the very best, eliminate the preamp and go directly from DAC to amps. Start with the digital source and make this as good as you can afford, then the DAC, then the amps.
I have some original KEF reference spaekers that are highly modified. Really outstanding. I have not really liked the new KEFs with the integral tweeter, even the highest models.
I agree on the receiver. You cant expect to get world-class sound from this. Look for something used on Audiogon.
Steve N.
Empirical Audio