if you want to output to tv then i suggest a nice AGP videocard. Maybe you could have the internal videocard run a separate monitor, and with a touchscreen.
Depending if you want to use vista then i think you should go for the maximum ram the motherboard will allow. Anyway the vista home premium comes with a nice media center, and the TCP/IP stacks in vista are a lot faster than XP, so internet browsing and downloads in vista are a lot faster than any other os out there.
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