I have a very similar situation. I have 7002 Towers and bought the CLR3000 because I watch a lot of TV and DVDs and wanted a great center channel with clear voice and dialog. Yes, the CLR3000 can over power the fronts, but when you adjust the level down a little it is Perfect

. The 3000 CLR is
awesome and I am very, very glad I got it! (FWIIW, I replaced 2006 towers ( predessor to 7006; actually moved to media room sHT system) and the CLR3000 would have worked with them also).
One word of caution the CLR3000 is pretty heavy, about 55 lbs, make sure your shelve of stand is braced to support it!
Good Luck ... I know you will make the RIGHT choice ... Enjoy your new CLR3000
The Denon 3808 should drive it fine. The ceiling speakers are really for presence and either will work. I have some Def Tech ceiling speakers for surround front and rear, the bipolar model, don't remember exactly something like UWBP.