I haven't got a screen in the main room. (I just painted the wall based on projector central's recommendation and it actually turned out fairly good.) The Energy speakers fit perfectly on the either side of the screen, but the Infinity speakers were too big. I tried them under the image for a while and broke down last week and put them on stands to the side. They sound much better on the sides, but I may have shaved a inch or so from my image to make them fit.
My set up isn't the best because I am limited by the fact we will be moving within the next year to 3 years, so I did my room as a temporary setup with the easy up ...easy down "no build". (Re-paint the wall..take down the PJ and patch 4 screw holes.) Plus it is in the basement, so it doesn't have to be the neatest setup. The wife/kids get the top two floors and I get the basement...well, I did until the PJ which is why the other PJ has come in handy.
A 150 inch screen might be a bit much from 10 feet back...not for me, I slide my chair up for in the face 3d, but I started with a 47 inch TV in the room, went to a 55 inch TV and then to a 70 inch TV (which seemed too big at first), then to a 92 inch screen for a pj, to a 120 inch image, painted the wall and went to 150 inches, got a 1080p projector and jumped to 169 inches (painted more wall), so it took me a while to get there. (And a lot of mistakes as my wife has come to call them.)
I have a thread "Steve's cheap build" with pictures, but please keep in mind it is in my basement with exercise machines and a mixture of furniture from old to new (the wife has the good furniture/stuff upstairs in the family room and in the living room), so the main room in the basement is a media/game/exercise/nerd room. Also, I haven't updated the pictures with the Infinity speakers.