Also be advised (you may know this already) that if you go with the Def-Techs they like to have some "Breathing room" between themselves and the wall behind them. There are countless posts here and other forums about this fact. It will make a tremendous difference in the way that they sound. So look at the depth of the speaker and where you are wanting to place them. I would say a bare minimum of 8 inches away from the wall. There are many that have them 12-14" away due to the fact that their setup's allow this. This will dramatically effect the sound stage.
Both are good speakers. Mantis states that he does not like bi-polar speakers for music and I do, so there are plenty in both camps, just know that the placement will be more critical with the Def-Techs.
Good luck and enjoy which ever you choose as I do not feel that there is a "wrong" choice to be made here. Just make sure you take music/movies you know well and demo both A LOT and see which one you ultimately just like better.