DAC's ?

I got mine for free & it benefited from a 1 hour upgrade using parts I already had.

I see you already found the ebay stuff, as that is what I was going to recommend next.

I would suggest checking out the archives not only here but on other audio sites to see what you can come up with. Doing your homework will yield the best results.

Perprtual 3A or Musical Fidelity A3-24.Both sound great, are fairly recent and can be had for less than $400.My favorite cheap/old DAC was the Soundstream DAC 1.They were designed in conjunction with Krell Digital and still sound good today!

One things for sure. The 855 doesn't need much. Very nice sounding unit. At least through my very modest setup.
Seems like Soundstream is mostly car audio.
I think I would save my pennies and get an older Musical Fidelity Unit. I really like the look of their CDP's. And they are very reasonably priced. But I will land a a good DAC soon.

The 855 was a highly thought of,good sounding and recommended player.It was subject to foot fault(skipping if not isolated from floor vibrations).Soundstream tried to get into the home theater/home audio market in the late 80's or early 90's.They had a line of slim profile amps and components.The DAC 1 was the sweet spot in the line-up.