I just purchased a pair of Diamond 8.4's and a Dayton 10" Titanic MKIII kit. I'm now looking for a pair of surrounds. I like the DFS design and AYSELECTRONICS is selling the EVO's for $190 and the Diamonds for $160. For $30 more i would be inclined to purchase the higher end speaker however I have concerns about it matching up with the Diamond towers. If you have strong opinions for or against the Bipolar design I would be interested in hearing them. At some point I would like to get a 6.1 or 7.1 system and would rather ADD than REPLACE speakers.