That looks like a GREAT match- I wish such things happened DownUnder!greystoke, the d4 801 is said to be very powerhungry, i dont think it is an ideal partner for the humboldt.
shortwave audio has an alexia2 for 26k pounds. in england, so no tax for you.
Wilson Audio Alexia 2 | SHORTWAVE AUDIO
I have Magic A5s, and I thought the Humboldt had JUST enough power to run them well.
But then I changed my speaker cables from high-resistance foil-type cables to some Espirit Kappa- it gave me like 3dB of extra headroom- the things really rock now, sounding sensational and so controlled. Bass is tight-as and I'm loving the whole presentation.