Last night, I did the A/B comparison between my 250's and the Def Tech BP8b's. Not only did I still prefer the 250's, but I appreciate them more after doing the test.
I was reminded that the 250's have the perfect amount of bass for my room. One strike agianst the Def Techs was too much bass*, which tended to overwhelm the other frequencies. This has me thinking that trying the 360's in my room might not be such a good idea after all, as they also have much more bass than the 250's.
Instead of saying that the Primus's are "great speakers for the price", I think it is fair to say that they are simply great speakers, and also happen to be affordable.
*This begs the question: Why do the Def Techs not seem to have too much bass in my HT setup, which is in an even smaller room? Possible answers are 1) My Yamaha HT receiver doesn't put out much bass, or 2) Surround processing sends most of the bass to LFE (even with mains set to "large".)