Duncan,

this is what I have: http://www.tnt-audio.com/accessories/spider_e.html

It's very cool, easy to assemble/adapt and can carry a lot of weight (50 kg per level). There is an amp stand as an accessory that carries up to 150 kg if you need more... smile

The site of the manufacturer that offers a configurator is here: http://www.finite-elemente.de

Cheers,
Thomas