There are a number of people on this list who would ask if you intend to listen to 5.1 music or movies, then recommend an omnipolar, or bipolar/dipolar speaker. The bipolar/dipolar speakers are said to produce a more diffused sound more suitable for movies, and these are almost never referred to as bookshelf speakers. Likewise, in many instances a "surround" speaker is more often called that because it is designed to be wall mounted than because it is bi/di. I bought my gear because I listen to music (SACD,DVD-A, Redbook)about 40/60, and I've *never* had a complaint about using an omnipolar speaker in my setup.
Bryan...what sounds best to you is the way to go...