Go immersive. On my 2nd build for others. Can't tell you how frustrating it is to install it and not have it myself. Roughing in one on Saturday coming up.

Your room would be loaded to the point of giggliness with 2 sb-2000s let alone 4 ep500 subs if you set them up right. I would consider your room a small room, a large bedroom size @1300 cu.ft. Mojo experienced 2 of the subs I mention in a room virtually identical in size to the room you are building @1700 cu.ft. Very fun in there.

The M5HPs in your new room would rock it to the point of ridiculousness if you asked them to. If you went all around 7ch MP5HP in wall with decent in ceilings and subs you would have a stunner of a setup at a bargain price. You could have a wall mounted fixed frame screen. Perfect for your small room. You just have to make sure your side surrounds are not firing into the ear of a person seated nearby. This will mean placing them slightly further back by a foot or so.