I'm a first time poster here and a newbie when it comes to acoustics, so I'm looking for some help with treating my room. It's nice to see that there are some top notch pros participating here, such as Ethan and Bryan, and I'm hoping that you'll all steer me in the right direction.
First of all, my HT/music room is also my living room, so in order to keep my wife happy whatever I use has to be as decorative as possible. The room measures sixteen and a half feet wide, by twenty three feet long, and ninety five inches from floor to ceiling. The walls are pine bead board over sheet rock and the ceiling is pine library paneling over sheet rock. The floor is concrete slab covered with vinyl flooring most of which is covered by a rug.
The room has a number of issues: along the long wall on the right there is an open bay window (which my wife would prefer to keep open), along the left long wall there is an open hallway, and the rear of the room is entirely open to the kitchen. My current speaker setup is 5.1 using Magnepan 3.6Rs as fronts (with a sixty one inch DLP TV between them), Magnepan CC3 center, Magnepan 1.6QRs as rears, and built into the ceiling above the TV is an infinite baffle subwoofer using 4 eighteen inch Avalanche drivers.
My goal is to treat as much of the room (walls, corners, and ceiling) as needed, and without making the room look too much like a recording studio. I really don't have the time or the equipment to do room measurements and with my schedule I don't have time for DIY bass panels, diffusors, etc.. I'd rather buy pre-made treatments and install them myself after I've been told where to put them. I get told where to put things a lot, so I'm used to it.

I realize that pictures of the room would be helpful and I will try to get some posted this evening. And I would greatly appreciate any advice you folks could give me on this project.