best power conditioners under 4k

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. 

Regardless, to answer the OP's question, Inakustic 3500P.  

Furman with LiFT and SMP. 

3E_P
 ~ 15 years ago I was co-owner in a company I named Audio Tweakers, so I get it BUT replace will with can.

I have a bunch of scientific and esoteric Machina Dynamica tweaks including his springs to isolate all my components, New Dark Matter, a must have to significantly improve the sound of any CD/DVD player

If OP owns a house, running a dedicated 20AMP line would be very beneficial

As to PCs, I have owned quite a few different brands (PS Audio Premier Power Plant, most expensive; Furman, Equitech, and BPT)

For the last 2 years I have been very happy with my Core Power 1800, to which I will be adding a Deep Core. These 2 MIGHT make a dedicated line moot, or close enough
hth

Inakustik 3500.  Search the existing threads on the 'gon for comments, and draw your own conclusions.