For my money, the Roland KS 12 is the holy grail of stands. It takes all of 5 seconds to set up. Add 30 if you're adding the second tier brackets. I got my KS 12 many years ago with a Roland RD-250. I think these days, the legs are black, not chrome, and they sell for $240. Expensive yes, but you get the compact stackable load, the quick set-up and plenty of real estate for your pedals. I added a mixer to mine, and jerry rigged second tier brackets.
http://i869.photobucket.com/albums/ab258/d2300/KS12-stand.jpg
http://i869.photobucket.com/albums/ab258/d2300/DODmixer.jpg
The mixer is an ancient DOD, 4 mono inputs, stereo outputs on XLR and 1/4". The KS 12 stand in the default configuration is the perfect width for mounting a 19" rack mount unit. (The width and height are adjustable.)
http://i869.photobucket.com/albums/ab258/d2300/mixer-side.jpg
I also added rubber bumpers for the keyboard to sit on.
http://i869.photobucket.com/albums/ab258/d2300/front-mount.jpg
Front mounting is with a piece of one-inch angle aluminum, sheet metal screws into the stand, and a nut and screw for the rack ears.
http://i869.photobucket.com/albums/ab258/d2300/rear-mount.jpg
Rear mounting is an L brace supporting the weight of the mixer.
http://i869.photobucket.com/albums/ab258/d2300/2nd-tier.jpg
Second tier bracket (a no-name brand) is designed to mount vertically, but that would have put the second tier keyboard too high, so I cut it and bolted it back together at a right angle. I jammed a piece of plywood inside the cut part so it wouldn't collapse when it was bolted back together.
http://i869.photobucket.com/albums/ab258/d2300/2nd-tier-mntd.jpg
The clamp end just so happens to fit the KS 12 stand perfectly. The brackets aren't rigid at the right-angle bend, but they don't have to be. They're designed to rest on top of the bottom keyboard, with carpet scraps double-taped on the bottom side. I also cut the tubing back a bit to eliminate another inch in height.
http://i869.photobucket.com/albums/ab258/d2300/2-keybd.jpg
I've been using this with different keyboards for about 20 years or so. Fortunately, I've always had a bottom keyboard with all the controls close to the front. In fact, that's a major part of my buying decision.
http://i869.photobucket.com/albums/ab258/d2300/Mt-Lmn-Kvn.jpg
Heres some guy (who looks a lot like me) playing my rig before I got the Nord Electro. You'll notice I hadn't yet cut the bottom of the 2nd-tier tubing to eliminate that extra inch added by the higher profile of the RD-300gx.
http://i869.photobucket.com/albums/ab258/d2300/iPad-Stand.jpg
I had to throw this in - my jerry-rigged iPad stand. Its made by On Stage. It comes with an L-shaped arm to clamp onto a mic stand. Fortunately, the base threads onto a standard mic stand, which is how I use it. I cut the hole for the 30-pin connector and added the bent-open eye-bolts to clamp the iPad to the stand. They can be moved to accommodate horizontal or vertical orientation. There are springs against the wing nuts so they dont rattle off in transit. Back when I rigged this up, iPad holders were still made for a bare iPad with no cover. Mine has the Gumdrops case which makes it too thick to fit the clamps of one of those. These days I think the tablet-holder stands are more versatile.