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A receiver integrates the component selector (your audio and video ins/outs), the preamp, and amplifier. You can go components, but I honestly don't see the benefit of going separate for an amplifier. An HDMI switch does not (should not) alter the digital signal. It merely routes the signal to the output selected by the user. A receiver will receive the signal and decode as necessary and output as necessary to other components and speakers.
I have a 56" Samsung DLP TV with two HDMI inputs, so I am surprised that a Sony would only have one input. A switcher may do well, but I don't ever use the TV speakers, because they all sound like garbage. Regardless of source or content, I send all of my audio through my receiver and enjoy a much better sound.
I recommend just saving your money and doing it right the first time. Your current setup doesn't sound terrible, but there is no sense in trying to buy pieces that you won't be able to sell for a good price later.
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