Ok, I got it all setup!
Honestly, unless you need the HDMI switching, I'd take the 703.
They sound the same and they look the same, and they weigh the same...
Speaking of weight, the 803 is considerably lighter than the 801. I don't know if Onkyo produced a power supply that is more efficient or if they are getting cheesy with their stuff, so just a heads up!
~Chuck