I have B&W 7NT and CNT for the front line powered by Rotel 1066/1075 combo. So, when the time comes I'm thinking of upgrading my rear speakers to 1NT. However, since 1NT costs ~$1400 with its stands, I'm having a second thought; what if I get B&W 600 which's less than half the price and add RB1080 for stronger main left/right? How're are 600 series speakers doing with NT range main speakers? Would it make quite a difference? Would it be a better idea to go with the same range? Thanks for your thoughts.