I'm in the market for an amplifier and streamer and had considered the NAD C368 integrated amp with BluOS 2i streaming module but I'm also also aware of the C658 Streamer/DAC/Preamp + C268 power amp. The two set ups seem to have almost identical specs with regards to performance measurements but with the latter also claims to have an upgraded DAC chipset, Bluetooth supporting the slightly newer AptX HD codec and finally Dirac. Obviously the price difference is quite large so I'm interested to know, has anyone listened to both of these and can you tell me is it worth spending the extra for the c658+C268 combo? Also whilst at I'm at it, within these price ranges is there anything else I should be looking at? Thanks