Have a look for the z-style stands. I find them to be a little less tippy... also with the x style ones the height is dictated by the width of the keyboard or device on the lower tier. they feel sketchy all x'd up tall.
Thanks Lampdog. Is it pretty durable (I tend to bang the hell out of my Live II, so I wanted something I can bang on top, and get busy with the keyboard at the bottom).
I had one of those for my Triton Studio on bottom, and Moog Voyager on top. They both have some good weight to them, but never felt like it was too much for the stand.