Best small used monitors under $1000

I have a room just a bit larger, 11.5 x 13.5.
The best speakers I've ever had in this room were Boston Acoustics T-830s; but they are a small floorstander.
Other stars were/are the Genesis Physics model 7 for their crystalline clarity; but a bit shy on bass.
PSB Imagine XB. All the bass you can handle and smooth, sweet vocals.
What I'd like to try: NHT C3s, but then I'm partial to acoustic suspensions.
https://www.nhthifi.com/products/16546-c-3-bookshelf-loudspeaker#specs

Well as akg ca said the Rega 1 family are speakers you can listen to 24 hours a day and never get listener  fatigue , dead natural with a 1 cap X-over , easy to drive and  to look at .
On of the best buys ever in audio !

Triangle Titus 202.   First version.   OUTSTANDING small monitors.  Very efficient and work extremely well with tubes.  Bass response is limited below 60hz, while treble is very extended.  Some say they can sound bright.  I find them to be natural.   Lightning bolt fast transient response.  They image extremely well in depth and width.  I would pair them with a tube amp, or a warm class A SS amp.   Once positioned correctly they will disappear.

I just purchased a pr of used Von Schweikert VR1s in very nice condition. They sound amazing with the Primaluna. Still wonder how the Quad 12L and Spendor S 3/5 compare to the S3/5r2. Any have or hear these?
Thanks 
Brian

I’ve owned the 3/5, 3/5r, 3/5r2 and the SA1. They all sound very similar except for the SA1, which was brighter than the rest. BTW, I now use the Harbeth P3ESR that I like better than the Spendors or any other LS3/5A type speaker that I have owned!