set up right, you sould be able to get some very dynamic sound from that system! They key will be in proper speaker and seating placement, as well as overall set up. Still, the Klipsch's are dynamic sounding for sure. While I haven't heard the models you described, I KNOW YOU CAN GET A VERY CLEAN AND DYNAMIC system with the older RB3(?) book shelfs and that Def Tech sub! You sould also be crossing the speakers over as "small"(or at least "smaller") on your receiver, and letting the properly integrated(and placed) sub do the bass!!! They system will ROCK DYNAMICALLY!!
If those Klipsch's have powered subs in them, then that might change the set up paramaters(I'm not familiar with your Klipsch models listed).
Still, for a "first system", I think you'll get a good gauge of what you like with it! It will be strong for rock and movies at the very least. Now whether you like the refinement for other music, that's somethign you'll have to find out yourself....but I like your chioces I think! Good luck
