I think that your speaker choices may out-class the receiver. The processing in your Denon should be fairly good. I would get a good 2 or 3 channel amp for the front L/R or front L/C/R. The pre-outs on teh receiver will allow you to use external amplifiers. This can make a bigger difference than putting great speakers in front of a modest receiver amplifier. For your receiver as-is (no external amp) your choices look good. Check out the Von Schweikert stuff too.
Good luck!
Good luck!