need help picking amp for paradigm spekers.

i am new to all this so i will try to explain the best i can.recently bought paradigm moniter 7 for fronts,cc370 center,adp 370 rears and ultra cube 10 sub.then bought a denon 3806 av receiver,and denon 2910 dvd player.the speakers and dvd player are alright but the receiver seems to not have enough power.even for movies.i was told i could add an amp and use the receiver as a pre amp.i want to power all five speakers but not sure how high of wpc to go with.or brand will spend a few thousand more to make the neighbors hear it please help. thanks