This is a nice summary of the Denafrips lineup
I have the Pontus II and Hermes DDC. It’s a great combination. The Hermes lowered the noise floor and opened up the soundstage, improved imaging and transients etc. It has an I2S connection too which is nice. $2500 would get you that combo used. Not having heard the Venus I would still hazard a guess that my setup is close to its level, although it likely sounds different. There are also other R2R DACs out there that folks seem to like such as the Gustard R26 or the HoloAudio May. If I were to replace what I have it would likely be with the Terminator or something similar. However, I am more than happy with my setup and plan on enjoying it for a very long time.