Join Date: Oct 2008
Location: DuBois, Pennsylvania
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the 667 is simply a more powerful (slightly modified) versions of the 606.
so, they're pretty much the same receiver.
if i were you.
i'd go for the 6100.
its the same system, except without speaker stands, sirius ready, and not as good of an ipod dock.
id save the money for what i consider the "unnecessary items" in the package.
also, the 6100 and 7100 were released at the same time.
so neither one is newer than the other.