My current setup is a Harman Kardon AVR 3550HD receiver with Definitve Technology Pro Monitor 1000 fronts and Pro Center 1000 center. I am looking to make an upgrade to the Denon AVR 4311 receiver and Paradigm Studio 100 fronts and Paradigm Studio CC-590 (maybe 690 if I can swing it) center. If I don't save and purchase the receiver and speakers together which would be most impactful to purchase first?