Shankar, hello again. The Onkyo 504 is a fine unit and has good provisions for surround sound if you can get a couple small speakers to use as side surrounds(which I'd recommend, including for 2-channel source material, using the DPLII mode). Set the M3s "small" with an 80Hz crossover and leave "double bass" off. Your sub(do you still have the Wharfedale SW150 per our discussions about three years ago?)and the M3s should blend very well at 80Hz, although 100Hz wouldn't be a bad choice.

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Enjoy the music, not the equipment.