i wall mount 2 ergotron monitor arms and 1 ergotron keyboard arm, have had this setup for a year or 2, it's pretty awesome.
I guess if i wanted to, i could easily raise up the keyboard tray and monitors to standing height, but my chair is pretty awesome, so sorry can't help you there, just saying that i wouldn't trust anything else but ergotron, oh and to illustrate it, the monitor arms are above my head when i sleep, and i don't worry about dying to monitor death.