Polk Audio Monitor 50's worth it?

[NY Yankees 23 2]

Are the Polk Audio Monitor 50 floor speakers for $100 each or so worth it? right now i just go the Polk RM6750 surround package and wanted to upgrade a little bit. i would then take the 2 front speakers and put them in the rear to make a 7.1 system (yes i have room behind my couch). I ike the way it sounds now. i really dont need a major upgrade at this point but do want floor standing front speakers. i got about $200-$300 to do this. its not much but... i also looked at the Monitor 60 series but at twice the price they didnt seem to be a major upgrade over the 50 series or do i not know what i am looking at/for? Anyways any advice on these or anything else in the price range would be appreciated. Thanks !