Upgrading Home Theater...need suggestions...

Hello all, I will give you a quick rundown of my current setup and would like some suggestions on upgrading. I am not looking to go all out. I have a smaller house and would like to add a few new pieces to my home theater. Specifically my front speakers, but I am hoping you can give me a good recommendation based on what I currently have and what would match up nicely with my reciever and current speakers, etc.

TV: LG 55"
Reciever: Yamaha RX-V371BL 5.1
Center: Polk CSR
Front Surrounds: Polk R150 Bookshelf speakers
Rear Surrounds: Polk R150 Bookshelf speakers
Subwoofer: Dayton SUB-120 12"

I would like to stick with Polk, because I feel for the money they offer great performance. These affordable Polks I have been running for about 5 years are still great, but I would like a bit more in sound. Any recommendations?

How would the new Monitor 55T front surrounds work? I am fine with older models as well. Looking to stay under $200 per speaker.


Thanks.

After researching, I think I may go with the Polk Monitor 60's. I think they should pair good with my receiver and center channel.