Want to Upgrade my L/C/R speakers.

[JTStarkiller]

Hi guys!

I recently upgraded my receiver to a Denon AVRX1400H for my 4K OLED, but now I'd love to replace my old Polk speakers with something better. At the moment I'm rocking just a 3.1 setup, so I'd like to just replace those three speakers (sub is fine). Money isn't so much of an issue as space, so I'm wondering if there's anything in the smaller range that would pack a decent punch.

Right now I have two Polk RM7s and an RM7 center I believe. I like the size of them since my TV is right behind the center speaker, and would love to get something similar, but can go bigger if absolutely need be. It's been such a long time since I've looked into audio products so I really dont know what I'm doing.

I love watching movies, playing PS4, and listening to the occasional LP. Any recommendations (doesn't have to be Polk) or help would be sincerely appreciated. Thanks!

JTS