**For completeness I want to state that I did post this over at AVS forums in both the general "Speakers" sections as well as the official "Polk Audio Owners Thread". After waiting 16 hours and not getting any replies at all I expanded my search and found these fantastic forums that look to be much better for Polk specific info. I am incredibly impressed at the qaulity of help provided by this community to users of all levels. Now, on to the question(s) at hand.
To sum up, I just purchased a co-workers entire surround setup for very cheap because he was moving to a sound bar (He went with the Polk Audio IHT 6000 which I recommended to him because I own and absolutely love this sound bar which provides sound for the main living room set-up..aka not my man cave home theater). So basically I want to know if I should incorporate any of the new speakers I just purchased from him into my HT setup or if what I am currently using is superior. All my current gear is Polk and the newly purchased gear is also Polk. I know most of these measurments are more objective and depend on personal preference, but if one of these new speakers is far superior sonically, offers a better sound stage etc, I would rather swap that in. My current set up is:
FL+FR = TSI300
FL+FR = RT55
RR+RL = No model number or sticker on them. They are Polk, a bit smaller than the RT55's, have printed above the tweater "Dynamic Balance", and have a tweater and a mid along with two side by side air holes at the bottom. They look like they would be sold along with the RT55's as rears because they are identical finish, identical grill cover etc.. Just smaller. I can provide a pic if needed.
Sub= JBL PowerBass PB10
He also threw in a BOSE VCS-10 center speaker he used because the polk was too tall and covered up a section of the bottom of his TV picture. I also got all the speaker wire, hdmi cables, Harmony 550 remote and speaker stands.
So in conclusion, I can swap these new speakers in one pair at a time and do listen testing, callibrating, etc... But I have very litmited time as well as a new 7 month old princess that I do not get enough time with as is, so if I can be informed that for example, the RT55's will blow away the current OWM3's I am using as rear left and right, I will just swap them in and re-calibrate the whole setup trusting that I am going with the speaker set. I am not going to swap in the Onkyo in place of the Denon because I am fairly certain the Denon is a superior reciever. The Onkyo is going to go into the main living room (with the Polk sound bar) as the hub of that area (unless I can unload it for a descent price via craigslist).
Thank you to all whom take the time to post any information to help me with these decisions! I am so happy I found these forums and I look forward to becoming and active member and contributer here in the official Polk Forums.