The Pontus buffers and reclocks the data from the SPDIF port, so is less sensitive to the quality of the streamer than most DACs. The downside is that there are users that report sound glitches if the streamer clock is too far off in frequency from the DAC clock. If you aren't experience these problems, I'd probably recommend sticking with what you have, or spending the money to upgrade to a Venus II, or a used Venus or Terminator).
If you do decide to upgrade your streamer, I'd recommend getting one that has a USB output option which I think works better than SPDIF on the Denafrips DACs.