Best small used monitors under $1000

Let's talk about all the components in the system not just speakers.
brian

If you go used

Proac tablets

Proac response 1sc great if you can find a set most people keep them

sonus Faber has a bunch of nice small speakers that can be had under a grand now consertino domus comes to mind

ls 3/5 as people mentions but they need more power then most small speakers

Monitor audio and Dynaudio have some wonderful speakers under a grand too

That's a start so many more 

Some great suggestions here. Another is the Eminent Technology LFT-16a, a magnetic-planar/dynamic woofer hybrid that retails for $1250.

Any Green Mountain Audio monitor such as the Callisto or Europa, possibly the Rio also