Within a few years switching amps will probably account for the majority of the market, with multi-channel AVRs and integrated home theatre systems moving over to them. Harman Kardon's current DPR2005 uses a 7 channel switching amplifier module. The integrated will become the de-facto switching amplifier configuration, as the inherent capability to translate straight from PCM or DSD to PWM allows the elimination of conventional analogue stages in the system. Various existing chipsets allow this sort of thing.