Hi, I have just purchased my Yamaha RX-V550 + NS-P436 (6.1 speaker + woofer). My usage 60% movie ; 40% music. Now I'm looking to add another pair of floor stand speakers for Music purpose. My choice is Yamaha NS-515F or Jamo E670. One of my friend told me that Yamaha speaker is not very good, however If I use Jamo speaker, the sound may not be smooth when going from NS-P436 6.1 speaker to Jamo E670 speaker. What is your recommendation? Should I get NS515F or E670? or some other branded speaker? Thanks in advance for your advise.