Thanks for the help!
In the UK, Marantz were regarded as having a pretty bright sound not suited to classical music. The SR5400 was well reviewed, but I went for a Cambridge Audio amp that excelled at warm, rich stereo performance. If I could get the same amp here I would!
I am very tempted by the H/K amps though - they had a great reputation in the UK, and also they seem to be Ascend's choice to accompany their speakers.
I was looking at the H/K amps on JR.com, and wondered what the advantage of the 3480 would be over the cheaper 3380? I know it has more power, but I'm unlikely to be driving my speakers to high volumes.