Is a high priced Line Conditioner needed

Jafant, the 'middle of grid' is absolutely irrelevant to the quality of power. The quality of delivered power depends on power lines only. The age of power lines, connectors, isolation, type having the most of impact. Some of the powerlines, depending on 'who's the boss', don't get maintained on time and properly to preserve better profits. They're highly affected by wind and other weather conditions so they could 'kiss' each other and create a surge in nearby dwellings or kill transformer and create outage.

Moved to a new home 3 weeks ago and have just installed an upgraded dedicated circuit. Main panel is Cutler-Hammer CH series with copper bus bar, subpanel is GE Master Load Center with copper bus-bar. The subpanel is tied to the main with massive 6/4 conduit and I'm using 10/2 Romex (for now,...other options too pricey at 16-25 dollars per foot, with 5 outlets I needed about 150 feet of cable) BUT I have installed an Environmental Potentials EP-2050 on the main house panel to protect everything and an EP-2750 Ground Filter on the dedicated circuit. I have heard nothing but good things about the EP units and that combined with the copper busbar panels should be a nice upgrade in the entire system's sound....very excited to hear the result once i finish unpacking! I'll still be using my Purepower 2000 on the system as a whole but may go straight into the wall for my Edge amp and amps in the Legacy Aeris towers. Ultimately I think I'll move to a Running Springs Audio Dmitri but time will tell if this move can happen....

With dedicated circuits, I have found that an easy and effective route to take with very good results is to install a Shunyata Defender (about $200.00) in the unused outlet. This little device cleans up some (inevitable) noise from the AC AND gets your equipment protected without any ill effects on the dynamics.

I recommend you should get a monster power htps 7000. I own
three of them, they do a good job of power conditioning and
protecting from spikes and surges. It sounds good to my ears.
Don't listen to the monster haters, you can always return it
if you don't like the sound. I highly recommend it!

Update...went with a new Bybee Stealth (latest revisions) with a combination of Furutech Gold and Rhodium outlets early last week. I had the good fortune of picking up a fully broken in version that had been with reviewer until the week prior on a prior reserve order. The PP is gone and won't be coming back; I am ecstatic and blown away by what the Stealth is doing for my system, better imaging, even quieter and more black backgrounds, increased precision coupled with naturalness of images, instruments and voices,....this unit is beyond my expectations and is without a doubt the best I've had in my system........