Used Zoethecus racks come up in your price range from time to time check them out. They're out of business now but nice racks
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04-16-07: AudiotombTom's right.
Replace the Salamander stock shelves with two (or three, or four) custom sized Neuance shelves ($220/ea) under your source and preamp or integrated amp, put sorbothane between the shelf supports and shelves and under the remaining components ($40), and for an additional $490 you have excellent isolation and unbeatable flexibility.
Of course, it's substantially over the $200-$500 budget.
IMO, if you have to choose what to isolate, then concentrate on your sources, followed by any tubed components. You're better off spending the entire budget providing excellent isolation on your primary source component than you are spending the money on a mediocre rack that will not provide sufficient isolation for any of the components.