Need power conditioner advice. In reference to Furman/Tice/PS Audio/Richard Gray.

I would stay away from the PS Audio PPP. That was the one made overseas, and had problems. I hated the one I had and sold it. Plus for some reason the PPP is overpriced. Most sellers seem to be asking the original retail. which is way way too much. Plus it is out of date, unrepairable.. all told a terrible investment at his time. ANY other PS Audio product is a better choice than a PPP.
I own a Furman REF20 I bought used nine years ago, and still use it, recently swapped to Furutech duplex inside it.                             
For your needs.. I would suggest try adding some PS Audio Noise harvesters around the home. They do not need to be right next to the stereo lines, or on the conditioner. Nearby is good. If you are using multiple devices, the first one in line should have one or two PS Audio Noise Harvesters.They are on sale right now at Music Direct $75. And the only reason they are better than other more expensive similar types is they are way cheaper now. They used to also be $299, then $199, then $150, now $99. I own seven of them and really like them I started out with two, and two did a lot to clean p the AC in conjunction with a power conditioner. Testing with a noise sniffer the PS Audio did a good job. Each one removed about 150 to 200 ’units’ of noise on the line (where 0 to 999 is the usual range. and the average noisy line is 750) You can use the blinking light to discover the worst offenders! (For me the laptop power supply! the plasma TV, but only when turned on, and my CD changers. I was surprised how well the Noise Harvesters helped to make my system sound better.

If you have any wall warts or digital power supplies, it's worth putting them outside, on another device.

I would have to clarify the Tice Powerblock III Signature version would be the "C" revision (the last revision; again 15-18 years old, but that doesn't always mean a weak product). I also realize that unfortunately the power cables are built in to this unit.

I do have multiple PS Audio Noise Harvesters as well as Quietlines, Akiko Tuning Sticks, and Electro Clear QRT plug in units at work (all thankfully gained at a discount). Some are placed throughout the house, some I've made essentially a super filtration strip with (they seem to work better with multiple similar units plugged into an old Monster 2100 or 1100 power strip and then that strip plugged into the Furman than the units individually plugged into Furman outlets, it's weird, but I've tested it out in multiple ways). I also have Bybee QSE's a Shakti Stone, and some other non-powered tweaks to help. Every little thing helps a bit, especially given how many things are plugged into the Furman (including a PC/computer which makes the Noise Harvesters act up; they rarely blink when the PC is off). Still if something works better than the Elite, especially at an affordable price, it would only help.

I greatly appreciate the advice on the Power Plant Premier. Some have popped up as low as the $700 range so it was tempting.
I've also wondered about Audio Magic conditioners, especially with their internal silver wiring- seeing as I use power cables with silver conductors I think there would be good synergy there; but I have no clue as to how well they work in terms of filtration and resolution.

Synergistic Research conditioners with enough outlets seem to be out of my price range. I've looked at Shunyata units as well, but again ones with enough outlets seem out of my price range. Most of the other premium brands like Pure Power and Equi=Tech seem to be beyond my price range as well. I already have a Monster 7000 MKII Signature conditioner and MIT and Transparent isolators, so I'm aware of the type of filtration and resolution those manufacturers provide, which is another reason I'm curious about how these other manufacturers' conditioners are since each manufacturer's power products have a certain signature audio and video performance in my experience.

I put Richard Gray in my system and immediately sold it....ruined the sound.  This was a few years ago...maybe its different today, but not for me.

Since you have many AC things and seem to be good at arranging the parts of you AC cleaning.. I would then suggest a high end duplex. A Furutech GTX-D Rhodium NCF. or Oyaide top of the line duplex outlet(s) Replacing all the AC duplex in my entire system (including as mentioned the ones inside my Furman, the increase in clarity was great) but even one or two added made a positive difference.