http://www.hometheaterforum.com/htforum/index.php
that could be a valuable resource for you 
When I was wanting to build an HTPC system, I was looking at Radeon 8500 AIW cards and Leadtek solutions for a TV Tuner card.
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Asus A7N8X Deluxe | AMD AthlonXP 2600+ | 512mb Corsair XMS Extreme DDR
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