I would like to get a used PC or a cheap-O that I can use on my Panny 30" T.V.

I know nothing about PC Video cards? I will need Componet or HDMI output for imput on my Panny set, I will be using it for emulation(mostly Arcade Mame)

What's my options and what kind of price range am I looking at here? Or is a Xbox Mod the better way to go?

Thanks, not sure if this is the right place for this?