Ananth, in my view you should consider both the 2400 and 3805, which both feature automatic calibration and equalization(or for a closer price match, the new 2805).

As to the speakers, the M60s use a 5 1/4" driver for the midrange, which appears to give a slightly more forward and detailed presentation than the M50s, which use their 6 1/2" woofers to cover the midrange.

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Enjoy the music, not the equipment.