Looking to upgrade my towers

Sorry to be so late in chiming in; seems nothing has been mentioned about your general set up. What is the size of your audio/video room? How far from the forward wall are the tower/front surround speakers, how far from the side walls, how far apart and how far from the speakers is your viewing/listening area? These are all details that need to be addressed and tweaked in order to get the most out of any audi system. 
In my video system I have a set of a set PSB Stratus Goldis as my front surounds/stereo mains. When set up properly (at least 3' from front walls, 2' from side walls and 6' - 8' apart)  with good components and proper room treatments, they sound very good. In my video room, because of room and wife restrictions they can't be set up nearly so well and while they sound great in my surround sound video, in stereo audio mode they don't sound nearly as nice as they can. This system is ok for casual listening when streaming Pandora etc but for serious listening, I'm very lucky to have a separate and adequate space, available and set up just for audio.
The best speakers and components would sound disappointing if not properly set up. If your room and wife will permit, you may have to make some placement and set up adjustments to get the sound you're hoping  for
Best of luck,
Jim 

Thanks for the info, it looks like you've got plenty of room to experiment with your set up and the placement you have now should be a good place to start with whatever upgraded speaker you're considering.
Best of luck with your with your project.
Happy listening,
Jim