I use the Quik Lok M-92 stand. It is quite sturdy, has great leg room unlike the 'X' style stands and folds up fast.

Another stand that I really like is the Standtastic brand.



The Standtastic stand takes a minute or so to set up and fold up but there is no other stand that is as versatile in height and width adjustments. The tiers have three positions of tilt and telescope out to fit any depth of keyboard.