dude, i havent tried sVGA to HDMI or USB to HDMI for myself but remember this :
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sVGA to HDMI - no audio, you will only get video in this connection.
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USB to HDMI - based from the cd-r king adaptor, you will get both audio and video in this connection.
option:
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sVGA (laptop) to sVGA (HDTV) - i'm currently using this connection in my bedroom (turned one of my HDTV into a monitor) but my cable comes with built-in 3.5mm audio cable for transmitting audio from laptop to HDTV.
here's a sample of the cable :
sVGA cable with built in audio jackagain word of caution : this set up will only give you a video with either a stereo or mono audio.