I would do amp/speakers unit first regardless of brands.
4 responses Add your response
You should see if the dealer will give you a short term loan of both pieces of Nagra gear. Then you can hear in your system which you would like to upgrade first.
If you just bought the Devore from him, and you are goign to buy the Nagra from him as well, he should be willing to do this.
The Nagra gear, which I have heard many times in a familiar system, is top notch, so hard to say which piece will make the most difference in your system.