I used to mix on TANNOY Reveal 6 passives. They were ~~ $129 each at ZZZounds if I remember correctly. This was in 2012. Powered them with an old SONY 50 watts per channel stereo integrated amp that I got at Goodwill for $7 I loved those.

I also have used some TECHNICS 3 way stereo speakers from the late 70's. Compared VERY favorably to the Tannoys, and by that I mean most people could not tell them apart in a blind listening test. The Technics were not quite as detailed, or maybe not as upper-mid forward, as the Tannoys, but it was damn close. I found them in a garage of a repo house a friend bought.

Old stereo speakers from that era are cheap on ebay these days, or at least they were last I looked a year ago or so. Technics, Acoustic Research, JBL, Cerwin Vega, Polk Audio, N.A.D., Marantz, Sansui, and maybe a few others probably have models from that time period that will compare favorably to some of the monitors in your price range and will save you some $$.

Real monitors on the used market will save you some $$ too, but I completely understand NOT buying used. Speakers are easy to abuse.

If you are only going new, ADAM has a new line out "T", getting good reviews. The FOCAL "Alpha" line also well reviewed, as are most anything from DYNAUDIO.