>>>what is the best non-conditioning surge protector on the market?<<<
I guess you would have to try one for yourself, and see how much of an effect they have in/on your system, but my favorite is the very budget priced Tripp Lite Isobar Ultra.
I make this recommendation, because I have been a Radio Broadcast Engineer for over 25 years. It is common for lightning to strike broadcast towers, and these surges and strikes sometimes find their way into radio station studio and office buildings and equipment, and transmitter sites and equipment in them. I am now retired from broadcast engineering, but I had these surge protectors all over my broadcast facilities, and feel they did the exact job they were designed to do - protect equipment plugged into them. Lightning strike after lightning strike, I never had one blow up. This includes power outages, and switch-overs from utility power, to UPS power, to generator power, and back to utility power. I use them all over my house too. But here's the thing I most love about them; when placed on inductive devices (like my refrigerator, my furnace, or any other device with a motor in it), they prevent pops and clicks from taking place in my audio system, mainly because they filter the AC feeding the devices I mentioned, and control the surge when the inductive devices turn ON and OFF.