I got my PS4 last night, and I'll be testing it out extensively tonight!
One thing I want to make sure you understand, using one of these processors will be the DAC in your audio chain... none of them just process virtual surround and then pass the digital signal along to a separate DAC. The tube amp you mention sounds like a good one
I have used the original DSS and Recon3D USB with movies, I also have a Mixamp 5.8 that I only recently acquired so I've only used that with gaming so far. I'm a little less picky about positioning with movies, it's nice but the DSS and Recon3D perform basically at equal quality.
That said, the Recon3D will let you tweak a few more sound characteristics. I actually really like a moderate amount of dialogue boost for movies, sometimes I bump up da bass
, and when I'm tired I like smart volume to compress the range of volume to not be too loud or quiet, but around the same predictable volume... however in gaming I mostly just use dialogue boost and minimize other options that can decrease the soundstage effect.
The DSS has fewer tweak options, just a sub-bass boost. However, you don't have to plug it into a computer to "reprogram" it, just turn a dial on the side of the box. That bass boost is pretty good, it is "aimed" at lower bass frequencies that add atmosphere and just sounds nice, and for gaming you can actually slightly reduce bass by turning the dial all the way down. It may seem like a small thing but I love that it has an on/off switch.
The Mixamp 5.8 has the same Dolby Headphone processing as the DSS, but it also has the added compromise feature of wireless (no wires between TV and couch, but soft soft hiss added in the background).
Pacific Rim from the iTunes Store on an AppleTV (with optical out) sounds amazing!!! Too many great audio moments to count off the top of my head. I also can't wait to rewatch Inception on my new rig.