What is the best transport?

I want to upgrade my transport. I am using the Audio Note CDT 2. My dac is the Audio Note 2.1x sig. I have not yet auditioned any new transports, but have read up on the Audio Note CDT 4 and the Esoteric P-03.

Both of these are in the 16-18k price range. My budget can go that high. Will my dac be good enough or be overpowered?

What else is available which should be considered?