FeisalK, you just pretty much picked my receiver for me

I was looking for a receiver that I may want to use later on when I upgrade, and as of now, all my components are silver. A smaller receiver is perfect, as well (as space is limited).
So that Dual Amp Drive diagram you attached above isn't a specific way I have to wire it myself, it's just the way the XR55 and XR57's run the speakers, right?
I want to understand this fully: a- you suggested this receiver because it'll drive a 2.1 set-up better than other receivers because of the way it runs in 2-channel mode, and b- since HDMI is video and audio, i need 2 HDMI cables, right? one from the source to the receiver, then from the receiver to the TV? im guessing the HDMI-capable receiver acts as a switcher for a few sources.