Some experience (Score 2, Informative)

See http://www.tbcconsoles.com for a few ideas.
Chairs - Haven't found anything to beat the Herman Miller Aeron yet.
If you're placing PC's in the control room, beware of heating and cooling requirements. Most common mistake I've seen.
Second most common mistake, way over-spec'ing the AV system for the videowall. Keep it modest, in keeping with your actual requirements and conop, with room to grow.
I like the single tier monitor approach. Get monitors above other monitors makes for an ergonomically uncomfortable experience.
Do not, under any circumstances, cheap out on the monitors. Buy decent. Voice of experience here, cheap has the potential to kill your project dead