Below is a pic of where the new tank will be placed (on the right where the sofa is and the pics go away). We kinda' think the 180 and 210 with their 24" in depth (front to back) just come out into the room too far. Agree?? I know it's hard to tell from a pic, but we have got out the trusty tape measure and the 180 / 210 just seems to take over the room (almost as wide as the sofa and 3/4's as deep).
We feel the 150, although only 18" from front to back and perhaps a bit more of a challenge to plant, would certainly be a better "fit" for the room. It would be a bit more of a "sleek" design, if you will, and round out the room nicely!