Usability of Oppo BDP-93 without a monitor?

I never had the 93, but I had one of the older, cheaper models, and it was quite respectable on SACD and HDCD, as well as audio DAD, which is one of my favorite formats.  I just used it as a DVD player, but connected it to my audio system just to play SACDs.  Never used it with a DAC, but I've always owned good CD players for serious listening.  But I think you'll be surprised at how good the Oppos are, especially if you aren't listening side-by-side with something better.  As a matter of fact, my DVD player just broke and I was thinking of buying the new Oppo 205.  

I do have one other question about this unit. If you choose to use an external DAC, do you lose the ability to play SACD’s or HDCD’s? In other words, I’m not clear where the circuitry to decode those formats "lives." Right now I have a Musical Fidelity M1 DAC, so I’m trying to figure out if I use that external DAC whether it will mess up the functionality of these other disk formats. Hope that question makes sense. Thank you!

@stfoth - 
Makes sense, thanks!