Figured I would upgrade this thread for anyone interested.
I went ahead and ordered both the Polk Monitor 60 set as well as The Boston Acoustics CS260 II set.
The reviews I had read online were spot on about the Polks being brighter, but I disagree when people say they are fatiguing. I actually prefer the brighter polk tweeters when it comes to movies and they don't really bother me on music.
As far as the Boston Acoustics towers, the tweeter is noticeably more subdued from low volume all the way up to full tilt. I also noticed the Boston Acoustics towers offered much more for a person who prefers a laidback type sound. They also seem to be a little less efficient than the Polks. This isn't really a blessing or a curse to me. All it means to me is that I can get the volume knob a little higher on the Boston speakers before I get audible distortion; but, at a lower volume setting the Polks are already just as loud. In my opinion, though, the Bostons really benefit from the amp while the Polks could maybe be used straight from a receiver.
At lower volumes, the Boston towers seem to have more low end to them; but its really hard to tell once you really crank it up. The Bostons seem to have a more smooth type bass while the Polks seem to be a little tighter and punchy in the lows. Neither speaker extends very low, but I wasn't expecting them to. Both, do, however at least play below 30hz just with no where near the same authority as about 50hz and up. You can tell the notes are there though. (Slightly more so with the Bostons)
I really think that if I had to listen to the speakers right out of the box, with no type of EQ or anything, I would probably stick with the Polks, but given an EQ, I think the Bostons could surpass them with some slight tweaks. I almost feel like the more laidback Bostons belong in a bedroom while the brighter more "in-your-face" Polks belong in a den or living room.