Audio racks that can handle heavy components

Solid steel and Sound Anchors.

I like the look and sturdiness of Maple Shade. I chose the ones with wheels for ease of movement. Great catalog. I spent $1,400

https://shop.mapleshadestore.com/Modular-Equipment-Shelves_c_111.html

I'm very happy with my Monolith rack from Monoprice.com.  Supports all of my McIntosh equipment!

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.