Have been looking at a few amps (Onkyo 674E, Sony 1200ES, etc) and it dawned on me - would I actually need HDMI ports? I'll be getting the new Samsung LE40M87B LCD TV which has 3 HDMI ports. I'd only be connecting up a PS3, 360 and possibly a Sky Box. Presumably I could connect the PS3 via HDMI to the TV, the 360 via component, and the Sky box via whatever output it uses... I'd then connect the PS3 and 360 to the amp via optical, no idea about the Sky box yet. Presumably I don't actually need an HDMI-switching amp then? What is their main purpose - for TVs with simply one HDMI input?