That's certainly some high recommendations! I guess there's no doubt then that the D-100 would be a significant improvment over the Marantz SR9300's internal amps.
I'm located in Australia and have contacted Dusty, who's told me there's no problem shipping internationally and that a 220~240v/50~60hz version is available (for Australia, Europe, most of Asia etc). But obviously it would be difficult for me to take advantage of the 30-day trial and I need to be pretty sure of the quality of the amps before ordering.
Please keep the comments coming. This is very useful and, so far at least, sounding more promising than I could have hoped.