Before making a clutch decision and changing gears I would do a standard audition.
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Jaybo is right - speakers are the key. The 6300 and the 6900 do NOT sound similar. The 6900 is all about smoothness and coherence whereas the 6300 is about impact and agility. A nice middle-ground, and not just in the name, is the 6500.
Also, what would you change in the way your current system sounds?
Hmmmm...I would venture a guess that the 6300 would be the first one to try out on those speakers. I was very impressed by this new amp - and I even heard it on some of the most ruthless speakers ever made: Klipsch Cornwall III. The 6300 may even make you feel like keeping your speakers afterall! ;)
But if you do sell them, don't change amps until you get another pair of speakers.... The speaker/room interaction is what dictates the majority of the sound signature. The amp should merely compliment it because it can rarely do much more than that anyway, even though the 6300 is balanced and powerful enough to be polyvalent.
I always questioned whether or not I was hearing real music until I discovered McIntosh. After tons of other brands (and I still experiment a lot), McIntosh does it for me like very few others.
I think you would not leapfrog just by changing amp. Maybe mac is sweeter and warmer a bit than Marantz, but your speaker with it sleek design and its smallish woofers would never able to provide the body of sound you need to enjoy realistic classical music reproduction at home. I would rather go for an old design, if you could have an ugly big box at home, like tannoys, electrovoice, goodmans jbl studiomonitor frim the 70s 80s with at least 10' woofer. They were designed when the main source of music was analogue, and they have a more natural balance than todays speakers.