I know a lot of you guys have the Yamaha RX-V1400 or 2400. Recently, Yamaha came out with some new receivers in the RX-V line. Of interest is the RX-V750, which has most of the bells and whistles that I want - [e.g. 7.1, PLIIx, Up-conversion to Component, phono in, YPAO etc.]. Notably, it's price tag is a couple of hundred dollars less.

I'm thinking about going with the cheaper 750. Here is what I will be sacrificing (for about $150)....

1. 100 watts/chan instead of 110
2. .06% THD instead of .04%

Maybe some other things...

My questions are:

(a) Will 90-100 Watts per channel be enough for M60s, VP100, QS8 & M2s in 7.1 setup, or will my sound suffer?

(b) How much difference will there be between the harmonic distortion present in each? Will it be audible?

Thanks in advance!