Audio racks that can handle heavy components

I haven't heard Atacama from the UK mentioned. I spent a lot of time looking a while back and ended up purchasing the Evoque Design Edition. It has been extremely solid and hasn't flinched with 200lbs on it. I thought it was "reasonably priced" relative to some of the other options.

Also, I recently bought a new amp and need to raise one of the shelves ~4 cm. No problem since they offer aftermarket legs for a reasonable price. That is solid customer support in my book.

Using Quadraspire SVT which limits 175lbs per shelf. Price depends on number of shelves. Very stable with moderately heavy components, including 140lbs amp on top shelf. 

Boltz - solid steel, powder coated, configurable and made in the USA. Boltz

Timbernation

Check out the Salamander racks.  I purchased the single SU20 Salamander Designs Synergy System Core Modules from Crutchfield for $500 each. They support up to 150 pounds.  There are larger versions available depending on your needs.