Build Media Pc I Want To Build A Home Theater Or Media PC. What Parts Should I Get?

I want to build a home theater or media PC. What parts should I get? - build media pc

I would like to build a home theater PC, but I do not know what they are buying. If anything I make videos, DVD, AVI and MP4 watch, and with a TV tuner to use to show this kind of installation can I expect? What is important? Do I need a video card = high-end, or a processor? Is it really necessary to obtain a large amount of RAM? Please help