You might need to spend at least $400 to buy CPU, mobo, RAM, DVD Burner, and Hauppage WinTV card. If you willing to wait for better performance processor then wait for Core 2 Duo E4200 to release in about couple weeks.
Asrock 775i65G (Supports Core 2 Duo)
Patriot Signture 1GB RAM (1x1GB)...