I have to agree with rollinrocker on this one... though I also have to agree with MacManNM and zumbo as well. Let me explain.
I personally think that the Paradigm speakers will be much more accurate and musical. However, the Def Tech's are likely to be more thrilling for home theater/movies. As for whether the powered woofers in the Def Tech's will be sufficient, only you can decide. They will definately give you some shake, shimmy, and slam... but accurate? enough? who knows.
So, what do you listen to most? Movies or music? Are you willing to compromise the other for your preference? Or are you looking for the best balance for both movies and music.
In the end, if you like what you hear, then get 'em. Take a few of your favorite CD's and DVD's along; one's you know very well. Play both movie scenes and music, and let your ears, your gut, and the back of your neck be the judge. When you hear something that appeals to you on both music and movies you should get two reactions: your gut will tighten on the movie cuts, and the back of your neck should tingle on the musical tracks.
Well, maybe not... but isn't that what you're shooting for? Realism... realism that makes you react physically.