Yeah, I could do that, if there were some other compelling reason to go with the 663. Doesn't seem like there would be, though.
Thanks
The only real reason to get the 663 is the preouts, which you said you don't care about. It does have dual sub outs, but a y-splitter does the same thing. The Onkyo will get you a more robust amp, more flexible bass mgmt, will not clip video for HTPC users, Audyssey 2eq, off the top of my head.
The one thing that Onkyo did poorly with 605/705/805 is transcoding of component, the details of which I am fuzzy on. 720p, even if downconverted from 1080i/p. This is the one thing that would beg more research for me with the xx6 models if I actually still used component connection.
As Adam said, going superceded is usually money in the pocket, however, the street price you listed is pretty hard to beat. IMO only, I thought of the 805 as the best value of '08 in midline receivers, but it won't be that cheap, that's for sure. It has dropped to $425 as refurbed time to time, but don't hold your breath.