The Wadia 830 was replaced by the 301 which has now been replaced by the 302 (which is essentially the same as the 301, except that it's based on a Phillips mechanism because Pioneer is no longer providing OEM quantities of the stable platter mechanism).
Wadia didn't build a DAC that was based on the DAC section of these players though. Their thought is that at this price level, it was the best value to an integrated cd player.
There was never an "i" version of the 830 except that some people refer to 830's with the digital input option as 830i...
I'll leave DAC recommendations to others.
Hope it helps.