If you look at my 2 channel HT system and Bedroom systems, as well as some of my speaker posts, you will see that my speakers require placement near the back wall or inside of bookcases. The quest for getting good sound with these set-ups has taken me to purchase & experiment with a number of different speakers. With these types of set-ups, you should be looking at two types of speakers: acoustic suspension (sealed box) or front ported. Stay away from anything that is rear ported (which will disqualify a good number of speakers), as it will just not work. I will also add that given your set-up constraints, you should not spend a huge amount of cash on your speakers.
With that said, for my bedroom system, I have had excellent results with the NHT SB2 ($400 list) and the Omega Super 3/TS3 ($540) loudspeakers. The NHT's are a smallish, 2 way, sealed box bookshelf model that have a warm, musical presentation to them. They have worked well with all the music types that I listen to (pretty much everything with the exception of dance/electronica and hip hop). They give a respectable amount of bass and have a very listenable mid and upper range sound. The NHT's differ from B&W 's (300 and 600 series) in that the upper ranges are more relaxed sounding, not over emphasized like B&W's or bookshelf Polk's for that matter.
I recently have begun using the Omega Super 3/TS3's. I had these speakers built for me and opted for the Omega Super 3 product in the narrower TS3 cabinet. What excited me about these speakers is that they use one, high efficiency full range Fostex speaker ... no crossover.
.... (Anecdote ... one of the most satisfying small systems that I owned about 15 years ago used the original Bose 101 speakers (a single 4" speaker in a black indoor/outdoor enclosure) paired with a cheap ($130) Technics receiver and cheap a ($130) Pioneer CD player. Talk about a system that you would swear that you could hear inside the speaker and around the music) ....
Back to the Omegas... These speakers are front ported and are designed with both tube and solid state components in mind. These speakers are very musical sounding, without sounding overly lush. Absolutely dead-on with acoustic piano and vocals. Extremely clear sounding. They sound great played low. My wife commented on how good these sound (lite jazz; Norah Jones) and she is normally pretty indifferent to the whole audiophile thing. What could work for you with the
Omega loudspeakers is that Omega offers an in-home trial/return policy. I am considering getting the Omega 6 Grande to replace the AR 302's (which I love) in my 2 channel HT set-up.
Lastly, in the interest of saving you some time, the speakers that did not work out in this type of near wall set-up were: B&W 302's; Optimus Pro 5 LX; EPOS 11; Acoustic Research 15; EPOS ESL3; and Wharfedale Diamond 8.1 (came the closest).
Regards, Rich