PS Audio PerfectWave DAC vs Bel Canto DAC3

I am about to revamp/upgrade my entire system and I am looking for opinions regarding a DAC/pre-amp. I currently listen mostly to iTunes (apple lossless) into a Cambridge Audio DACMagic and CA 640Av2 integrated, but I would like to substantially upgrade and move to a DAC/pre-amp combo with a power amp. The top two contenders are the PS Audio Perfect Wave DAC and the Bel Canto DAC3, both of which offer laptop/iTunes connectivity with usb inputs as well as volume/input control to function as a pre-amp. I have auditioned the PS audio but not yet the Bel Canto. What should I know (other than the Bel Canto DAC3.5 about to be released and the use of the Bel Canto USB link for USB to SPDIF conversion)? I am currently using Totem Rainmaker speakers but would upgrade those as well.