My brother in law bought one of them 2 weeks ago refurb on the Onkyo deal direct and it sounds great after I calibrated it. The S7400 and S7409 are only 5.1 setups as far as speakers go, but the real gem is the receiver TX-NR609 with the free ipod dock. The speakers are pretty much free and that is a great little sub that comes with the package.
Never seen this anywhere near this low just look at what others are selling this for it weas $699 at Fry's when I went by there last week!
the one that comes with the nr609 is the s7409
the s7400 comes with the nr509
if you look closely at the pictures, you can see the difference