I have an Apex, a double-X and aa atable-style with second tier. I really don't care for any of them because the upper keyboard overhangs too much over the lower so you have to separate them too much to see controls and such. The QuikLock Z72 http://www.zzounds.com/item--QLKZ72 looks like it might permit more of a stacking setup than the others.

Whic keyboard stand would you suggest to help the two boards be as close to each other as possible - more organ-like ?