May I suggest you screw on the "High-boost" filters? It appears to me the general consensus is that the reference filters are the best but personally I always felt they subtract some of the "naked and glorious truth".
Cables and balanced mode to me just seem like hocus pocus. Tried to get something going here, but it attracted zero attention.
To give you an example; I can just barely hear the difference between a 128 kbps MP3 and lossless and I'am unable to tell the difference between 160 kbps and lossless , so, no, I don't think cables would do anything for me.
Don't do it man, you'll be sorry for the rest of your life... How can you sell you baby???!!! Haven't heard the SE846 but I just bet it won't sound anything like the SM3 . The SM3 is pure magic and always will be. Had a long good session with it tonight and it blows my mind. I love it and always will. Tonight all my other gear feel like mistresses, younger and sexier but the SM3 is the real deal.