The best I've used was the racing pucks, but they aren't cheap. I now use those on my VPI TT. I use audioquest sorbothane feet now - I think this is an area that DIY can save you a lot of money.
Herbie's "iso-cups" with gabon ebony balls under the transport and DAC (and amp). Plus Herbie's "tenderfeet" footers under our DVD player - really helped there too.
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