I need opinion between Yamaha RX V2600 or NAD T163 + NAD T973. As the price wise, NAD doubles the price from NAD but how about the performance? I am using it 50% Stereo and 50% HT

I like the video feature of Yamaha RX V2600 because it has HDMI upscale and up converting. What is the different when I combine Yamaha RX V2600 (as pre amp receiver only) + NAD T973 compare with NAD T163 + NAD T973 (in term of sound)?

Anybody have any other suggestion for budget US$ 2000 good pre amp + Amp (7.1 Channel) for 50% stereo and 50% HT, by the way I am using C.E.C CD3300R and B&W 603 S3

Thanks