I have the same setup (without the sub), tho that's not by design. I have a bunch of stuff - Decware Zen, Super 3's, Fi-X, Behringer 8024, 2 computers - on a folding/layout table in my theater listening room. The setup is aobut a 4 ft equilateral triangle. When I finally get setup for real listening (in other words, make or buy stands and rearrrange furniture) I plan to have them about 3 feet off the back wall, and I'll start at about 8 feet away and 6 feet apart.
I have no idea where they'll sound best - which is of course what you are asking, and getting little help with
