I did a lot of research on this very issue--because my desktop space is limited & my monitors/speakers end up w/in ~8" of front wall of the room w/big picture window.
Found 2 designs that should work:
-- ATC SCM19 Professional monitors: this sealed/acoustic suspension design is not exactly small, but it's spectacular in resolution, listenability, and bass resolution/quality. I am getting better sound w/these (+ Wyred4Sound ST500 amp) than any other monitors in past
-- Wharfedale Diamond 225: a considerably cheaper mid-fi audiophile design that is not sealed (ported bass)--but the port is cleverly designed to fire downward at a bottom plate that's 1/4" below the speaker. The result has been described as far less susceptible to boundary effects that conventional ported designs. They're also described as rather musical, pleasant-sounding speakers.
I've now had 2 ported speakers (powered designs) and 2 sealed/acoustic suspension designs (1 powered, the other passive) in this desktop environment. IMO the ported designs, despite other good qualities, showed clear evidence of boundary effects in the bass. I'll never go back to ported unless it's something like the Wharfedale Diamond.