Best Isolation HRS? SRA? Zoethecus? Symposium?

Check the Finite Elemente Pagode Masster Reference.
Great engeneering and build quality.
Probably my next buy.

To answer your question clearly: yes, an isolation device will make a big difference. Black Diamond Racing Cones give good bang for the buck. Symposium roller ball feet work a bit better, especially when you have the tungsten carbide balls, but they cost a lot more. (You pay the price for hard balls.) I haven't tried most of what the other guys are having.

I use a non-audiophile rack, too. Depending on the configuration of your shelves, Ken Lyon at Greater Ranges can custom build Neuance shelves to fit your rack. I use one for my digital source, and Ken custom made it to fit my Salamander cabinet.

I also use Symposium Rollerblocks and Aurios. Aurios are used in laboratories to isolate sensitive measuring/testing equipment. So, as far as passing the real world test, Aurios have the pedigree.

Frankly, I don't know that I can hear a difference using this stuff, but I figure they can't hurt.

I second Jtinn. Try also apex & formula shelf!!

For me, the choice wasn't even close. I opted for Silent Running Audio's Craz rack and Ohio Class XL+ isolation platforms, and haven't looked back. IMHO, there's nothing better on the market, and that includes Grand Prix Audio. The secret is that each platform, and each shelf on the rack, is designed specifically for the component it supports. Now that SRA is accepting trade-ins for old platforms, and offer new support pads for the rack shelves FREE OF CHARGE, it's no longer a monetary hassle when you change components. I could've bought any rack out there, and I chose SRA. It's a no-compromise solution--the best of the best, IMO.