Battle of the affordables

KEF first, Polk second. Your choices are all mass market brands, you might do a little more digging and see f there are some other brands that appeal to you. Amplification, musical preferences and typical volume levels matter as well. Some speakers can be hard to drive and really won’t show their true selves without the right amplifier. 

You have good amplification, that helps. And this list is fine, you will always get other suggestions in an open forum.

What are your listening habits? Genre preference? Typical volume levels? Are you a hard core rocker or jazz and acoustic? And room size, that makes a difference as well.