I have a similar problem in that my listening room will be around 10x13 (in the basement).
I have been looking at building (it looks easy) the North Creek Akora II (www.northcreek.com) which is specifically designed to be positioned relatively close to the wall. I have to admit that I haven't heard it, but the drive units are great in other applications and the filter looks like real serious business. You can buy the cabinet if you don't feel like making it yourself and still stay below budget.
I have been looking at building (it looks easy) the North Creek Akora II (www.northcreek.com) which is specifically designed to be positioned relatively close to the wall. I have to admit that I haven't heard it, but the drive units are great in other applications and the filter looks like real serious business. You can buy the cabinet if you don't feel like making it yourself and still stay below budget.