Speaker Selection Help

I'm on a $2200 budget set by my wife to upgrade my front left/right/center speakers. My room is approximately 2500sq ft. with hardwood floors. I'm using a marantz sr7007 currently with no amp. I'm saving an extra $1000 or so for a sub upgrade as well. I'm currently using polk audio rm8s as my surrounds in my 5.1 setup because my wife likes the small speaker look behind the couch. I dont mind upgrading them but they would need to be small if a suggestion is posted.

Thanks in advance for any advice.