I have not found any measurements for x2600 but if it is any like x3600h, then DAC is the least of my concern. A big reason to pick AVR is simplicity and adding a DAC to the system is adding complexity and very unlikely any improvementCongrats, but I've had the X2600 and had to connect an external DAC for better resolution in stereo.
For instance Shipping from Germany ( free) at €120,-
Fosi Audio ZD3 Bluetooth USB Desktop DAC ARC-, ES9039Q2M
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Denon: AVC-X3800H 9.2-Kanaals 8K AV-Receiver - Zwart
Denon: AVC-X3800H 9.2-Kanaals 8K AV-Receiver - Zwart
Doublepoint has x3800h for 832€ with code kerst15. Delivery is "within 3 weeks". Not world shattering discount but pretty good considered the mediocre sales during BF