I have the 100 and love it. I think it does a very commendable job in my 18 X 12 room (open on one side). Have I thought about upgrading? Sure. More is always better, right? From what I hear, the 150 is a better speaker in every respect than the 100. But if cash is an issue, youmay find, like I did, that the 100 will suit you fine. Of course, as everyone else has mentioned, we'll need some more info regarding your layout.