I'm a big fan of ProAc Tablette Reference 8's, and I own a pair of the Signatures. You can use these fairly close to a rear wall (mine are about 18" out in my office), and they sound pretty good. Another option is the bookshelf model from Induction Dynamics. I have heard these stacked in a bookshelf, with books right up against them, and they still sounded great.
Tom.
Tom.