I have had the opportunity to listen to both, but I personally don't notice a huge difference in them. I like the look of the Polks a little bit more (the Infinitys look a little more traditional vs. the Polk's more modern look). I don't however have the opportunity to try them out in my house. After some thinking about it, most of the time I will probably be listening to music from my PC, video games obviously (college kid), and movies really whenever I have company. Any personal experience with either of these brands? Or is it one of those situations where I'll be pretty pleased with either one? Also you mentioned the Primus 140 because it is smaller, what about the TSS-750, they're much smaller satellites, how comparable would they sound? Also, if I decided to go with the Polks in the front, would the Infinity's in the back still sound ok? Thanks for your help.