best power conditioners under 4k

Right. But not for the reasons you think. You're still getting noise from your appliances, and everything else for that matter. All that happened was you improved that one little thing. You can do the same for every inch of wire both before and after the conditioner. Which you could have done instead of the conditioner. And let's see that thing cost $1800 that would get you, ... uh huh.... right. You could have skipped the conditioner and had even better sound with unfiltering. Way better. And that's to say nothing of the panel and lines. All because it doesn't work the way you think. Oh well....

Correct. Well said. 
Its one thing to upgrade when you have a component you just can't stand. But any time you are basically satisfied and just want a little more you can get that and then some with tweaks, and with a lot less short term risk and a lot more long term value. Good to see you coming around on this one. 

Sorry. Didn't think it was relevant seeing as mine is custom but good point, OP may not have seen it yet. Here ya go.
https://systems.audiogon.com/systems/8367

The best power conditioner we know of isn't a power conditioner. At least not in the normal sense of the word. It doesn't filter. It unfilters.