Best Small Efficient Speaker for Office or Sm Room

I'm thinking of putting together a simple system for an office. A nice receiver or intergrated amp with tuner and CD player with small speakers placed on office furniture or speaker stands. I'm looking for a speaker that sounds good with very low power (25-40wpc) and at low listening levels. Another important part of the puzzle is that I don't want to spend more than $250 per pair used. Looking for some good feedback here. I'm open to any suggestions.