It's funny but you have your speakers positioned much like my office system. Due to lack of room, the only place was up near the ceiling corners at either end of my desk. I initially tried some Zu Omen Bookshelf speakers, but they really didn't click. I then bought the Vandersteen VLR's, which really worked out well. They are designed to be place on a shelf and near a corner for bass reinforcement. I use a pair of HSU subs, but to be honest, I really don't have to use them as the bass is pretty deep without them, when placed near corners.
Most people don't consider this little bookshelf speaker, I didn't, too, but I have to say the VLR's are one of the undiscovered speakers. Being in HI, I don't know if you'll be able to find a pair easily unless you can get someone to ship overseas.
Bob