I disagree with all the previous posters. At this level, the source is not going to make a huge difference. There is not a huge lot of differences in digital sources.
Based on your equipment, maximum bang for the buck will be to upgrade your preamp. Since you have a CJ amp, pick up a used CJ tubes preamp (Premier 17LS2 is pretty good), and be prepared for a big difference.
If you don't want to change the preamp, change the speakers. But digital source is the last thing I would change.
As a sidenote, why don't you swap out the Cal audio cd player for a $30 dvd player from wal mart and see the amount of difference it makes. You will be only out of $30 and if you feel there is a huge difference between the $30 CD player and your Cal audio, then go ahead and get a better digital player, as recommended by some of the posters above.
Based on your equipment, maximum bang for the buck will be to upgrade your preamp. Since you have a CJ amp, pick up a used CJ tubes preamp (Premier 17LS2 is pretty good), and be prepared for a big difference.
If you don't want to change the preamp, change the speakers. But digital source is the last thing I would change.
As a sidenote, why don't you swap out the Cal audio cd player for a $30 dvd player from wal mart and see the amount of difference it makes. You will be only out of $30 and if you feel there is a huge difference between the $30 CD player and your Cal audio, then go ahead and get a better digital player, as recommended by some of the posters above.