When I got my Def Tech's, I set a pair of them up on my desk using one of my little 30w Parasound Zamp amplifiers (small 8" x 8" amp fits in my hand) and a portable music player - wow, I couldn't believe how clear, detailed, and loud they played. They also had a shocking amount of bass for such small speakers.
Mine are the bipole RSS versions so they really spread the sound. They have a forward, slightly bright sound, so they integrated with my front Paradigm speakers quite well even though they are much more sensitive - had to turn the trim down for them. The RCS versions have the aimed tweeter / mid like you talking about and with their bigger mid (5 1/4") and much bigger passive radiator (6 1/2") these are going to have the punch you want for your front left / center / right speakers and with that amount of mid-bass should be very easy to integrate with a sub - expensive, but I think you will be impressed.
2-Ch (HT L/R): Oppo BDP-105 BD, Adcom GFP-750 pre, Bryston 10B Sub Xover, Bryston 4BSST2, Paradigm Signature S4 v.2, (2) SVS SB12-NSD subs, AQ & Cardas XLR
Home Theater: Bryston 4BSST2 amp / Paradigm CC-590 (C), Outlaw 7700 amp / (4) Def Tech UIW-RSSII (LS/RS/LB/RB), Samsung 46” 3D LCD