Hi,
Good luck with the sale. I have a ps audio hca - 2 that I modded to the hilt including power supply, signal caps etc etc. It performs on the same level as my $4250us Son of Ampzilla and is a little more transparent than this amp.
A cheap way to improve it is to replace 3 caps in the signal path with blackgates which provide a substantial improvement in sonics. In its stock form its a decent performer and if I lived in the states I'd buy it from you.
Regards
Rod