You would be better off buying a monitor for $100 instead of buying an adapter that might cost you upwards of that. My cousin recently bought a 20' widescreen at Best Buy for about $100 and I know amazon always has 18' for $100. As for audio, if you have an existing stereo just buy rca to 3.5mm cables and if you don't have a home stereo or computer speakers you can pickup some computer speakers starting for about $11 at Target or even better ones with a subwoofer for $30+up.
I use a similar set up and all it cost me was the hdmi to dvi cable to connect my pc's monitor. But I do plan on buying some more monitors later on for my consoles for lan parties.
If your 360 is the old hdmi-less model, you can pick up a 360 vga cable used for about $4 on amazon.
All in all, a set up like this offers much better quality than a TV tuner setup while it might cost you a few bucks more, it will save you time not dealing with drivers and wondering if it works with vista (if you use that). Sorry if im not much help, but having dealt with TV tuner cards in the past, id rather just save myself the trouble and buy a monitor.
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