Do you floorstanding or stand-mounted speakers - the Thiels are floorsatnders but you could really only get the smaller one used for that price.
What are you lookng for in a speaker - what characteristics do you like or don't like.
I really haven't listened to Thiels or Quads - but might I suggest Acoustic Energy AE309's - they list for $295 new and have that classic british sound.
Dave