It doesn't matter if you route HDMI through the receiver if the receiver doesn't convert all the material to HDMI format, you are still stuck switching your TV and receiver to a new input when you have an HDMI source. The BEST way to streamline your setup is to get a good universal remote that will do everything for you. So, you don't get stuck explaining 10,000 times what you need to do to switch from cable to DVD to gaming. In a really high end system, Crestron & AMX are used, but a Harmony remote may be the ticket for a TRUE streamlined setup, then everything else you can focus on doing the best way possible for ultimate image and sound quality.
I would skip looking for HDMI switching right now and if you need it later, pick up a Gefen HDMI switcher for your needs. Let the receiver handle component, s-video, and composite and ALL your audio needs. Mostly about your audio needs.