Liuhao,
The room is looking very good and no doubt things are sounding much better. I was happy to see your changes today. Working systems into living spaces is tough and one has to find the right balance.
Have you given much thought to putting absorption on the wall behind the TV and your LCD can sit on a stand on your entertainment unit. I bet that midrange you enjoy would open up that much more.
If all the panels are imposing, one trick I use is placing art (african masks and other enthic or suitable small scale and thin objects on the panels. Therefore, the panels act as a backdrop to the art. I attach them mostly with a thumbtack and some fishing wire, looks great IMO. Oh yeah, let your wife pick the pieces.
If you want to hang some nice heavy curtains for your slider doors that would be helpful as well, unless you prefer the clean sleek look (which it looks like you might). Great Job, and I hope you're closer to the music.