Re: New Here - Yamaha RX-V661 or RX-V861 (Bose Center)
given your speaker selection and budget the V661 isn't a bad way to go. the added channels (power amp wise) may come in handy (at least placement wise) when powering your sub if you don't want to run your mains through the sub's binding posts.
Are you HDMI ready or do you still have component video? That's really where the V861 is going to come in handy, since it has a more robust set of features in terms of HDMI, mainly upconversion from all analog video sources to digital. Where as the V661 can only switch between HDMI sources.
If HDMI is not a concern then save your money and get the V661. I can't imagine you'll be dissapointed. The differences in power output won't make that big of a difference in sound quality with Bose speakers. BTW, Bose makes a center channel that I believe is rather inexpensive or you could just get another double cube array and have unified L/C/R speakers which is always better.
That's my two cents. Sorry it seemed to take so long.