Upgrade to floor standing.

JBL is a good choice.

You might look at JBL Studio powered monitors as an alternative to keep within your budget. You sacrifice asthectis for more power and more reasonable price.

Klipsch is probably a good bet. 

JBL 590 are a great choice. 50% off right now. $500 each.  https://www.jbl.com/STUDIO+590BK.html?ged=off&mrkgadid=1&mrkgen=gpla&mrkgbflag=1&mrk...

I have been very lucky to have picked up a JBL L100T (modified crossover), L80T, and a mint pair of L200T3. I rotate through each pair every so often. They are the bomb for music and movies. The L200T3 is spectacular. Very efficient with tremendous clarity. 
Their easy to find used these days. I’m not sure of their current offerings in the midrange. I picked up a pair of ES-90 for $99 per new. I was not impressed at all. 

If you can find them older used Snell floorstanders are a great way to go. The A,B,C,and D series are well within your budget. I had the C IV and CV for a while and sold them to a friend who still listens to them.

Good luck