Well, I haven't received the Cremonas yet, but today, with 1 275 and the C2300, the sound is great, very warm, just as I like it. To balance all the warmness of the amp and preamp, I went for more analytical sounding sources:
Esoteric D05/P05 transport/DAC combo
Rega P9 with Dynavector XX2
AQvox phono preamp.
Cables I tend to prefer Nordost, for the reason above (they're very fast and analytical), and things are generally pretty balanced out.
Even in my currently small room, there's no excessive bass, and good imaging (not bookshelf-level, though). I'm moving to a bigger house, with a proper audio room, so things will be even better then
I think that perhaps you should start with the C2300, as you'll probably get the biggest improvement in your current setup with it, than with the 275 amp. I just got mine, a demo unit, for considerably lower than the MSRP.
cheers,
alexandre.