Why go with the Decco one box solution -- preamp, power amp, and DAC -- when you already have a preamp and power amp? I would think the Rogue is a better preamp than the preamp in the Decco. (I don't know much about Threshold amps.)
Overall, it would be less expensive to buy a NOS DAC (the $200 Valab DAC sold on eBay is highly regarded, as are the Keces and Audio-gd DACs) and a decent digital cable, which you would have to buy if you got a Decco anyway.
Also, in talking to a New York dealer and in doing my own web research, I was left with the impression that Peachtree product reliability has been "spotty" at least in the past.
Overall, it would be less expensive to buy a NOS DAC (the $200 Valab DAC sold on eBay is highly regarded, as are the Keces and Audio-gd DACs) and a decent digital cable, which you would have to buy if you got a Decco anyway.
Also, in talking to a New York dealer and in doing my own web research, I was left with the impression that Peachtree product reliability has been "spotty" at least in the past.