The difference between a 16:9 and 16:10 22" screen in horizontal terms is about 1.3cm, ~2%, with a reduction in height of about 2.2cm (~8%). Given that a 16:10 22" has about 2.8cm of letterboxing (1.4cm at the top and bottom) when playing a 16:9 video, the increase in overall viewing area of such videos is ~5%. Interestingly enough, this is roughly the same as how much more surface area the 16:10 screen has in total over the 16:9 screen. Thus, you'd be sacrificing about as much viewing area for everything else as you would be gaining for movie viewing. In addition, despite being physically larger, the 16:10 display has ~8% greater PPI ratio (at 1680X1050 vs 1600x900).
You can always use Pan & Scan to fit the movie, which will keep the movie ratio (no stretching) and chop small bits off the side, which are usually ancilliary anyway, which will result in you getting a larger viewing area.