I found (at the Toronto show) that a majority of the displays could be shot hand-held, as they are very well lit. For the darker ones you may have to turn the ISO up a bit, but otherwise a steady hand will do. I also tend to stay away from the flash, in fact I'd prefer taking a tripod and going on a day that's less busy. The lighting can be harsh like you said, but can easily be used to your advantage; I got a lot of nice natural contrast in the images and dramatic light. As far as white balance goes, I adjust mine when I process the images in my RAW editor. It's best to shoot in RAW mode, and worry about the white balance then.
i was waiting on a moment, but the moment never came. all the billion other moments, were just slipping all away. i must have been tripping, we're just slipping all away. just ego tripping.