Playback Designs MPS-5. Tubes have nothing to do with it, IMHO.
Spaz, mebbe it's none of my beeswax, but...
An important ingredient in recreating a sense of envelopment is a strong, diffuse, slowly-decaying reverberant field. In eyeballing your system, I see lots of absorptive panels lining the walls of your room, but no diffusors (maybe I'm not seeing clearly, though). I would suggest lots of diffusion panels and few if any absorption panels as more likely to give you a sense of envelopment than a new CD player.
Also, omnidirectional or polydirectional speakers create more of a sense of envelopment than conventional monopoles. And there are things that can be done in the bass region which also create or enhance the sense of envelopment.
Like I said, mebbe it's none of my beeswax.
Oh, I should have looked at your system first. Now that I have, yes, try to hear the Playback Designs MPS-5. It'll be at the Rocky Mountain Audio Fest in the Soundings room. RMAF will be worth the trip because you can hear almost all the alternatives there.
BTW, there are one or two top CD/SACD players with tubes, but, IMHO, that's not what makes them great. As a Pass guy, you know that it's the design and not the pieces used.
I can't look at your room and say that you need to change anything. If you need diffusion, it'd be at the rear. Something to consider.