Wow that's a tough one. I own a BV9, and I love it. If it, God forbid, should break down I would buy a BV11 instead. I'm blown away by the picture and sound of the BV9, but to be honest, it always runs Speaker 3 or Speaker 5 mode, depending on the input. I rarely put it in Speaker 1 mode, but think the mono speaker is pretty powerful. If you plan to run a set of front speakers, I wouldn't put this into consideration at all. I have not had the pleasure of playing with the BV11 yet, but it has some pretty big advantages as it is newer. The display is another technology than the plasma in the BV9, so I think the colours will be sharper and with a pair of front speakers I think sound will be more or less the same. I believe you're able to update PUCs yourself??
If I was on the market looking for a TV today, I would go for the BV11, simply because it's new and it's the BV5/BV9 successor, (at least in my eyes). The smart tv and 3D part I'm not interested in either.
Design wise I prefer the BV9, but you mention this as not being a factor.