Well, today I was looking into how to preview Vegas 7 to my HDTV and started researching HDMI video cards (such as the Intensity) and also found a couple NVIDIA / ATI chipset video cards with HDMI output ports on them. However, I also learned that my current NVIDIA 7600 GT card has a 7-pin HDTV connection (R,G,B) that I had thought was just a standard s-video connection, but that proved wrong. So I found the special cable that fits this 7-pin HDTV connection...now I just got to get a R,G,B cable to make the connection.
Looking at my HDTV's manual, it shows that it's YPbPr connection supports 1080i at 30Hz. So does this mean I should be able to successfully make use of this connection and be able to preview Vegas at 1080i on my HDTV? Is this correct?