The 671 is more equivalent to the 609; the 709 is a cut above like the 871 IMO. I would go with the 709 for several reasons: I prefer Audyssey and the 671's YPAO is like 2EQ not MultEQ XT; Dynamic EQ and Volume are much better to my ear than Yamaha's Adaptive DRC; the current Onkyo line has excellent amp sections; the 709 has preouts; and the 709 includes Dolby Volume which I like.
Went with Onkyo. Went to order it through Amazon and they are not selling it due to problems: "Item Under Review
While this item is available from other marketplace sellers on this page, it is not currently offered by Amazon.com because customers have told us there may be something wrong with our inventory of the item, the way we are shipping it, or the way it's described here. (Thanks for the tip!)
We're working to fix the problem as quickly as possible.
After reading this and the reviews of the 709, I decided against it and went with TX-NR809 instead. I know its a little over kill for my system but the reviews are good and it has more options over the 609.
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