Ok this is my personal opinion, not facts just one opnion.

The DSP7000 are very cool speakers. The amount of controlled bass output is staggering and frightening. This is just something that hits you in the chest right away when properly set up.

I find that the DSP5200 are close or on par in delicacy with the DSP7000. They are so much better than the DSP5000 in this respect.

The timbre of DSP5500 are more close to regular boxed speakers. The DSP7000 and DSP5200 have a cabinet that does much less colorations than boxed speakers imho. It is superior for the values I have.

If I had the cash for a used pair of DSP7000 I might consider going for them. But they are financially out of my reach for the time being.

Also I think the DSP5200 first version look better than DSP7000. I like the round grills much like the DSP 8000. I think they should do an updated DSP7000 MK2 with updated looks to DSP5200/8000 standard.

I have not yet heard the DSP3100, will give them a serious listen and comparing with my DSP5000 surrounds.

DSP8000SE, DSP7200SEHC, DSP5200SE sides, DSP7200SE rears, 861v8, 210, Sim2 Ultranero 4, Stewart Cinecurve 2.35:1, XEIT CM-5E Anamorphic lens, Dune HD Duo Cinema 8K and Wireworld Platinum 48G HDMI -> UHD722 -> Shunyata Omega Ethernet. Shunyata/Furutech power-cables/filters. SR Master Fuse@861v8. Uptone Etherregen with 10MHz OCXO clock.