I would not hesitate on the 150, I also have the 22s, and have a small depth room, 12ft. the room is 22+ long but the center, (c.c.) due to the room configeration has to fire the 12ft direction. I like to play most movies loud, often very loud (depending on the type of movie) You don't want to compromise on the center, that's not knocking the 100, cause I have never heard it. I am sure it's strong, but some more drivers is not something you will reget down the road. With the amount of content that that c.c. delivers in every movie, I don't think this is where I would compromise, most AV receivers will let you "dial in" the c.c. / d.b. level, it's also 6 ohms on the 150. so you won't be over-whelmed, but when you need it-it's there.
