I would recommend upgrading the CDP. One option might be to mod your Denon to make it a good transport and then purchase a modded DAC, such as the Perpetual P-3A or Musical Fidelity. You should be in the $1500 range to do this right. This combo will blow-away any stock CDP.
Finding a decent preamp is a more difficult thing to do. Even some of the best are still lacking in dynamics and extension. I use a heavily modified Mark Levinson #38.
Finding a decent preamp is a more difficult thing to do. Even some of the best are still lacking in dynamics and extension. I use a heavily modified Mark Levinson #38.