I don't doubt that an improvement can be made using an external DAC. With a budget of $2000, and the fact that your sources output SPDIF, I would consider searching for a somewhat older DAC known for possessing a robust power supply and excellent analog output stage. These can be had at a fraction of the original price.
Now, which ones to consider? I feel I am not one to make a recommendation here, for lack of hearing many (most) of the possibilities. I am using a Bryston BDA-1. It has several SPDIF inputs, and at the time of purchase I prefered the use of an external USB/SPDIF converter.
Now, which ones to consider? I feel I am not one to make a recommendation here, for lack of hearing many (most) of the possibilities. I am using a Bryston BDA-1. It has several SPDIF inputs, and at the time of purchase I prefered the use of an external USB/SPDIF converter.