Polk Center Channel - Sony Floorstanding - Help

I was wondering if anyone could help me out, i was looking to purchase a new set of Sony SSF-5000 speakers for my home theater, and currently i have a Polk 5-1/4 inch Center Channel (can't think of the model #, couple years old). Would it be alright for me to add the Sony speakers with the Polk center channel - or would the sound not match up?

If anyone has any advice for me i would love to hear it, thanks so much!

Thanks for the quick response, i believe the Center Channel that i am trying to match up with is part of the CSR Line. I am looking to spend anywhere from $100 - $200 for the pair of speakers. Any advice as to wear i should look, or for any speakers that would be a better match than the Sony's?

Thanks for the help Raymond, however i believe i am looking at the flip side of the case you presented - i currently have and would like to keep the Polk Center Channel, and am looking to add a new pair of Floorstanding Speakers to fit the theatre. I would prefer not to replace the center channel, as its only a few years old and lightly used up to this point. But any advice you could give as to a new set of speakers to pair up with the Polk center channel would be appreciated.

Update, the center channel that i have is the CSM model, not the CSR. So i assume with the M model i would want to look at the M model floorstanding speakers? Anyone pair up the CSM with the R50's? or am i best suited staying with the M ...

Thanks everyone.

Looks like i could get the M50's (in black) from newegg for $180 shipped, compared to the R50's (cherry) from frys for around $175. I would prefer the black in terms of my setup, but i don't think i would sacrifice quality if the cherry's were the better deal.

Any idea which one of these sets would match up best with the CSM? I have been reading that its not a wise idea to have different tweeter sizes between the center channel and the front speakers, which i believe would be the case with the M 50's (1 inch tweeter, CSM has 3/4 inch tweeter) ... will this make a big difference?

Thanks for the help all, went with the Monitor 50's which are arriving today.

Now am onto the receiver search to complete the room, any opinions between the Denon 788 and the Onkyo 576?