DAC's ?

I have the Rotel 855 & it's a decent player, having the TDA1541A. I tried it with a DAC but the digital out was bad, which made the next move easy. I replaced the analog out jacks with much better quality pieces. There wasn't enough room for the new RCA's, so I used the hole where the digital out jack was for the left out. If you take a look at the construction & materials of the stock RCA's, you'll see why this should be done.

I also cut off the power cord & attached a male IEC jack so I could use a better powercord. I usually install an IEC jack but was too lazy. I'll get around to it soon.

I was using this as an interim player but with these simple mods, I've decided it's good enough for now.

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.