I'd like to add my voice of recommendation to these already mentioned:
B&W 805 D4
Marten Parker Duo
Keep an eye out for used Focal Diablo Utopia Colour Evo's; They often show up in your price range.
If you're looking for small, these pack an AMAZING amount of sound in a little package while maintaining excellent quality:
Wilson Tune Tot
Raidho TD 1.2
Magico A1