Bear with me on this one; I am an on-again/off-again audiophile and am redoing what was a two-car garage for audio (2ch and HT) for my eventual bucket system. The room does double duty as a photo studio (go figure!) on occasion. I hate seeing wires snaking around and have removed the concrete floor so that wires can be imbedded in conduit, as well as installing radiant floor heat. OK, here are the details.
Room size: 22' w x 26' d x 11' high Wall of windows behind speakers on 22' wall. Speaker wires come out of floor 4' from front wall, and 7' apart.
Listening position is 5-6 ft from rear wall or nearly 15 ft from main speakers. Speakers are either Stacked DQ-10s with ribbon tweets, or Magnepan 1.6qr on hand for evaluation. I had two DQ-1W subs against front wall, about 4' behind the mains, and that configuration may continue subject to others' advice. Moscode 300 is main amp, Hafler for subs.
I can separate the main speakers 6', 7' or even 8 ft apart without having the wires show (petty, ain't it?). Floor will eventually be carpeted throughout. Listen to classic, celtic, folk, Broadway. Love a wide soundstage and depth. I will use a totally separate (cheap) system for HT.
This project will run $6K with me doing a lot of the work so I have little cash left over for improvements. I need suggestions for budget room treatments. My new wife is a genius with decorating (no more white walls javascript:void(0)

, so heavy drapes or fabrics are an option. Will take another year to complete the project including final touches. Any help would be most appreciated.
Bob