I'm a bit surprised that no one has recommended minimonitors. A highly braced cabinet with little surface area situated in free space usually produces outstanding staging. Many good choices are available in your price range. The key here is finding one with a tonal balance you like. The original ProAc tablette was the best imaging speaker I've ever heard, but tonally it was a mess (at least to my ears).
god luck
Marty
god luck
Marty