Amir should eventually get to measuring one of the Q Acoustics speakers, so we will know what are considered upgrades to that by then.
Meanwhile here's the LS50
https://www.audiosciencereview.com/forum/index.php?threads/kef-ls50-bookshelf-speaker-review.11144/
Some people/owners claim LS50W performs differently from LS50, others claim they are the same. Only time will tell.
IIRC so far the best speaker he's measured is the
https://www.audiosciencereview.com/...nelec-8341a-sam™-studio-monitor-review.11652/ but that is overbudget.
JBL 705P is somewhat ok although I don't feel it is that good in terms of value. Considering at those prices I want a perfect frequency response.
https://www.audiosciencereview.com/forum/index.php?threads/jbl-705p-studio-monitor-review.11944/
Because we have things like Elac Debut Reference that provides very good performance for much less money.
https://www.audiosciencereview.com/...-debut-reference-dbr-62-speaker-review.12232/
Some speakers like the Elac Debut Reference above and the Klipsch RP-600M can give nearly-perfect FR after EQ so that is something to consider. IIRC, LS50 also reacts well to EQ.
Buchardt Audio speakers are also in the review pipeline.