Look for a used pair of Vienna Acoustics Mozarts -- easy to drive, warm and musical, beautiful cabinetry. Another possibility is Vandersteen 2Ce. The newer Signature version will cost you about or a little more than a grand, even used, but the regular 2Ce model comes up on Audiogon pretty often and is a fine-sounding speaker.
Best floorstanders under $1000 new or used
Looking for a pair of floorstanding speakers with a non-fatiguing tweeter (soft dome, fabric, or aluminum if not bright) to go in a 23X15 room with a 10' ceiling. Interested in Quad 21L, 22L, but they may be slightly too short. Interested in used or new and wanted to see if anyone has has any recommendations. Any thoughts are appreciated.