Which of these SACD players would you choose?

Don't have any of them, but looks like you made a good choice for the money, as this player is focused on audio. Here is the review:

http://www.whathifi.com/review/Pioneer-PD-D6-J/

enjoy and keep us posted on how you like the player. Good Luck.

And here is another:

http://www.sacdcentral.com/?p=41

Tonight I did a little comparison between my Integra CD player and the borrowed Pioneer SACD/DVD player. First, I compared a burned to the standard track on the SACD on the Integra to see if there was any difference, I didn't notice anything. When I'd switch from one to another it seemed like the "new" one was slightly better until I switched again. Next I forced the SACD player into standard mode and noticed a huge difference in soundstage between the two. The Integra has a much fuller and wider soundstage compared to the Pioneer that was more centered. With standard CDs, the Integra sounded better to me. When I compared the Integra with the SACD track on the Pioneer the soundstage was about the same, BUT with the added quality of the SACD it now sounded like it was happening live and very front and center. I found it interesting that the same soundstage difference was there but went from a negative to a positive with added fidelity. As a note, when I compared the standard CD versions, I swapped disks in the players to confirm that the burned version wasn't audibly different.

I find it hard to compare at time because my audible memory is pretty weak, but some things simply can't be missed.

I should probably clarify that the Integra CD player is connected to my Integra 50.1 receiver with a Toslink so the receiver is doing the d/a.

I compared the Integra CD player using an analog connection tonight and it sounded very similar to the borrowed pioneer. I wasn't expecting the two CD players that are different brands and ages to sound more similar than the Integra CD player compared to itself using digital and analog connections. It seems the Integra 50.1 receiver must be using a different D/A converter to yield such a different sound. I'm not sure which one give the sound that is the closest to what was intended in the recording.