really small speakers less than 500

I can wholeheartedly recommend the mission 780. It was named "What HiFI" magazines's speaker of the year, and actually delivers on that reputation. The imaging is amazing, with great detail, and a wide, deep soundstage. They are small, about the size of Paradigm Atoms, but have a choice of real wood veneers, which look awesome. I am convinced these can compete very favourably with the B&W CDM1, at a much lower price.

I own the JPW 310 ($250 pair) in my second system and they are quite nice.

Agree that Sound Dynamics RTS-3 is a great speaker, see current review of this speaker in Positive Feedback. Also Audio Advisor is a good company to do business with and will give you a 30 day tryout. I am driving these speakers with the Magnum Dynalab 208 or the Audion Sterling 12 watt tube amp. Don't know which is best yet. Highly recommended speaker.